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The incompatible-properties argument is the idea that no description of God is consistent with reality. For example, if one takes the definition of God to be described fully from the Bible, then the claims of what properties God has described therein might be argued to lead to a contradiction.
The problem of evil is the argument that the existence of evil is incompatible with the concept of an omnipotent and perfectly good God.
A variation does not depend on the existence of evil. A truly omnipotent God could create all possible worlds. A "good" God can create only "good" worlds. A God that created all possible worlds would have no moral qualities whatsoever, and could be replaced by a random generator. The standard response is to argue a distinction between "could create" and "would create." In other words, God "could" create all possible worlds but that is simply not in God's nature. This has been argued by theologians for centuries. However, the result is that a "good" God is incompatible with some possible worlds, thus incapable of creating them without losing the property of being a totally different God. Yet, it is not necessary for God to be "good". He simply is good, but is capable of evil.
One argument based on incompatible properties rests on a definition of God that includes a will, plan or purpose and an existence outside of time. To say that a being possesses a purpose implies an inclination or tendency to steer events toward some state that does not yet exist. This, in turn, implies a privileged direction, which we may call "time". It may be one direction of causality, the direction of increasing entropy, or some other emergent property of a world. These are not identical, but one must exist in order to progress toward a goal.
In general, God's time would not be related to our time. God might be able to operate within our time without being constrained to do so. However, God could then step outside this game for any purpose. Thus God's time must be aligned with our time if human activities are relevant to God's purpose. (In a relativistic universe, presumably this means—at any point in spacetime—time measured from t=0 at the Big Bang or end of inflation.)
A God existing outside of any sort of time could not create anything because creation substitutes one thing for another, or for nothing. Creation requires a creator that existed, by definition, prior to the thing created.
Another pair of alleged incompatible properties is omniscience and either indeterminacy or free will. Omniscience concerning the past and present (properly defined relative to Earth) is not a problem, but there is an argument that omniscience regarding the future implies it has been determined, what seems possible only in a deterministic world. [1]
Omnipotence is the quality of having unlimited power and potential. Monotheistic religions generally attribute omnipotence only to the deity of their faith. In the monotheistic philosophies of Abrahamic religions, omnipotence is often listed as one of a deity's characteristics among many, including omniscience, omnipresence, and omnibenevolence. The presence of all these properties in a single entity has given rise to considerable theological debate, prominently including the problem of theodicy, the question of why such a deity would permit the manifestation of evil. It is accepted in philosophy and science that omnipotence can never be effectively understood.
The problem of evil is the question of how to reconcile the existence of evil and suffering with an omnipotent, omnibenevolent, and omniscient God. Evil in philosophy and most discussions of the problem of evil, is defined in the broad manner as all pain and suffering; in the narrow definition, evil is a moral concept involving condemnation of horrific behavior committed by responsible moral agents only. The best known presentation of the problem is attributed to the Greek philosopher Epicurus which was popularized by David Hume.
Theodicy means vindication of God. It is to answer the question of why a good God permits the manifestation of evil, thus resolving the issue of the problem of evil. Some theodicies also address the evidential problem of evil by attempting "to make the existence of an all-knowing, all-powerful and all-good or omnibenevolent God consistent with the existence of evil or suffering in the world." Unlike a defense, which tries to demonstrate that God's existence is logically possible in the light of evil, a theodicy attempts to provide a framework wherein God's existence is also plausible. The German philosopher and mathematician Gottfried Leibniz coined the term "theodicy" in 1710 in his work Théodicée, though various responses to the problem of evil had been previously proposed. The British philosopher John Hick traced the history of moral theodicy in his 1966 work, Evil and the God of Love, identifying three major traditions:
The omnipotence paradox is a family of paradoxes that arise with some understandings of the term omnipotent. The paradox arises, for example, if one assumes that an omnipotent being has no limits and is capable of realizing any outcome, even logically contradictory one such as creating a square circle. A no-limits understanding of omnipotence such as this has been rejected by theologians from Thomas Aquinas to contemporary philosophers of religion, such as Alvin Plantinga. Atheological arguments based on the omnipotence paradox are sometimes described as evidence for atheism, though Christian theologians and philosophers, such as Norman Geisler and William Lane Craig, contend that a no-limits understanding of omnipotence is not relevant to orthodox Christian theology. Other possible resolutions to the paradox hinge on the definition of omnipotence applied and the nature of God regarding this application and whether omnipotence is directed toward God himself or outward toward his external surroundings.
Alvin Carl Plantinga is an American analytic philosopher who works primarily in the fields of philosophy of religion, epistemology, and logic.
The argument from free will, also called the paradox of free will or theological fatalism, contends that omniscience and free will are incompatible and that any conception of God that incorporates both properties is therefore inconceivable. See the various controversies over claims of God's omniscience, in particular the critical notion of foreknowledge. These arguments are deeply concerned with the implications of predestination.
Omnibenevolence is defined by the Oxford English Dictionary as "unlimited or infinite benevolence". Some philosophers have argued that it is impossible, or at least improbable, for a deity to exhibit such a property alongside omniscience and omnipotence, as a result of the problem of evil. However, some philosophers, such as Alvin Plantinga, argue the plausibility of co-existence.
Meditations on First Philosophy, in which the existence of God and the immortality of the soul are demonstrated is a philosophical treatise by René Descartes first published in Latin in 1641. The French translation was published in 1647 as Méditations Métaphysiques. The title may contain a misreading by the printer, mistaking animae immortalitas for animae immaterialitas, as suspected by A. Baillet.
The existence of God is a subject of debate in the philosophy of religion and popular culture. A wide variety of arguments for and against the existence of God can be categorized as metaphysical, logical, empirical, subjective or scientific. In philosophical terms, the question of the existence of God involves the disciplines of epistemology and ontology and the theory of value.
The evil demon, also known as Descartes' demon, malicious demon and evil genius, is an epistemological concept that features prominently in Cartesian philosophy. In the first of his 1641 Meditations on First Philosophy, Descartes imagines that an evil demon, of "utmost power and cunning has employed all his energies in order to deceive me." This evil demon is imagined to present a complete illusion of an external world, so that Descartes can say, "I shall think that the sky, the air, the earth, colours, shapes, sounds and all external things are merely the delusions of dreams which he has devised to ensnare my judgement. I shall consider myself as not having hands or eyes, or flesh, or blood or senses, but as falsely believing that I have all these things."
The phrase "the best of all possible worlds" was coined by the German polymath Gottfried Leibniz in his 1710 work Essais de Théodicée sur la bonté de Dieu, la liberté de l'homme et l'origine du mal. The claim that the actual world is the best of all possible worlds is the central argument in Leibniz's theodicy, or his attempt to solve the problem of evil.
Theological determinism is a form of predeterminism which states that all events that happen are pre-ordained, and/or predestined to happen, by one or more divine beings, or that they are destined to occur given the divine beings' omniscience. Theological determinism exists in a number of religions, including Judaism, Christianity, and Islam. It is also supported by proponents of Classical pantheism such as the Stoics and Baruch Spinoza.
The Irenaean theodicy is a Christian theodicy. It defends the probability of an omnipotent and omnibenevolent God in the face of evidence of evil in the world. Numerous variations of theodicy have been proposed which all maintain that, while evil exists, God is either not responsible for creating evil, or he is not guilty for creating evil. Typically, the Irenaean theodicy asserts that the world is the best of all possible worlds because it allows humans to fully develop. Most versions of the Irenaean theodicy propose that creation is incomplete, as humans are not yet fully developed, and experiencing evil and suffering is necessary for such development.
The following outline is provided as an overview of and topical guide to atheism:
Alvin Plantinga's free-will defense is a logical argument developed by the American analytic philosopher Alvin Plantinga and published in its final version in his 1977 book God, Freedom, and Evil. Plantinga's argument is a defense against the logical problem of evil as formulated by the philosopher J. L. Mackie beginning in 1955. Mackie's formulation of the logical problem of evil argued that three attributes of God, omniscience, omnipotence, and omnibenevolence, in orthodox Christian theism are logically incompatible with the existence of evil. In 1982, Mackie conceded that Plantinga's defense successfully refuted his argument in The Miracle of Theism, though he did not claim that the problem of evil had been put to rest.
An ontological argument is a philosophical argument, made from an ontological basis, that is advanced in support of the existence of God. Such arguments tend to refer to the state of being or existing. More specifically, ontological arguments are commonly conceived a priori in regard to the organization of the universe, whereby, if such organizational structure is true, God must exist.
Skeptical theism is the view that we should remain skeptical of our ability to discern whether our perceptions about evil can be considered good evidence against the existence of the orthodox Christian God. The central thesis of skeptical theism is that it would not be surprising for an infinitely intelligent and knowledgeable being's reasons for permitting evils to be beyond human comprehension. That is, what may seem like pointless evils may be necessary for a greater good or to prevent equal or even greater evils. This central thesis may be argued from a theistic perspective, but is also argued to defend positions of agnosticism.
The Augustinian theodicy, named for the 4th- and 5th-century theologian and philosopher Augustine of Hippo, is a type of Christian theodicy designed in response to the evidential problem of evil. As such, it attempts to explain the probability of an omnipotent (all-powerful) and omnibenevolent (all-good) God amid evidence of evil in the world. A number of variations of this kind of theodicy have been proposed throughout history; their similarities were first described by the 20th-century philosopher John Hick, who classified them as "Augustinian". They typically assert that God is perfectly (ideally) good, that he created the world out of nothing, and that evil is the result of humanity's original sin. The entry of evil into the world is generally explained as consequence of original sin and its continued presence due to humans' misuse of free will and concupiscence. God's goodness and benevolence, according to the Augustinian theodicy, remain perfect and without responsibility for evil or suffering.
The Evil God Challenge is a thought experiment. The challenge is to explain why an all-good god should be more likely than an all-evil god. Those who advance this challenge assert that, unless there is a satisfactory answer to the challenge, there is no reason to accept God is good or can provide moral guidance.
The Proof of the Truthful is a formal argument for proving the existence of God introduced by the Islamic philosopher Avicenna. Avicenna argued that there must be a "necessary existent", an entity that cannot not exist. The argument says that the entire set of contingent things must have a cause that is not contingent because otherwise it would be included in the set. Furthermore, through a series of arguments, he derived that the necessary existent must have attributes that he identified with God in Islam, including unity, simplicity, immateriality, intellect, power, generosity, and goodness.
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