Agnosticism is the view or belief that the existence of God, of the divine or the supernatural is unknown or unknowable. Another definition provided is the view that "human reason is incapable of providing sufficient rational grounds to justify either the belief that God exists or the belief that God does not exist."
Theism is broadly defined as the belief in the existence of at least one deity. In common parlance, or when contrasted with deism, the term often describes the philosophical conception of God that is found in classical theism—or conception found in monotheism—or gods found in polytheistic religions—or a belief in God or gods without the rejection of revelation as is characteristic of deism.
The Invisible Pink Unicorn (IPU) is the goddess of a parody religion used to satirize theistic beliefs, taking the form of a unicorn that is paradoxically both invisible and pink. The IPU is a rhetorical illustration used by atheists and other religious skeptics as a contemporary version of Russell's teapot, sometimes mentioned in conjunction with the Flying Spaghetti Monster.
Irreligion is the neglect or active rejection of religion and, depending on the definition, a simple absence of religion.
Negative atheism, also called weak atheism and soft atheism, is any type of atheism where a person does not believe in the existence of any deities but does not necessarily explicitly assert that there are none. Positive atheism, also called strong atheism and hard atheism, is the form of atheism that additionally asserts that no deities exist.
Nontheism or non-theism is a range of both religious and non-religious attitudes characterized by the absence of espoused belief in the existence of God or gods. Nontheism has generally been used to describe apathy or silence towards the subject of gods and differs from atheism, or active disbelief in any gods. It has been used as an umbrella term for summarizing various distinct and even mutually exclusive positions, such as agnosticism, ignosticism, ietsism, skepticism, pantheism, pandeism, transtheism, atheism, and apatheism. It is in use in the fields of Christian apologetics and general liberal theology.
The existence of God is a subject of debate in theology, the philosophy of religion, and popular culture. A wide variety of arguments for and against the existence of God can be categorized as logical, empirical, metaphysical, 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.
Michael Lou Martin was an American philosopher and former professor at Boston University. Martin specialized in the philosophy of religion, although he also worked on the philosophies of science, law, and social science. He served with the US Marine Corps in Korea.
Ignosticism or igtheism is the idea that the question of the existence of God is meaningless because the word "God" has no coherency and an ambiguous definition.
Agnostic theism, agnostotheism, or agnostitheism is the philosophical view that encompasses both theism and agnosticism. An agnostic theist believes in the existence of one or more gods, but regards the basis of this proposition as unknown or inherently unknowable. The agnostic theist may also or alternatively be agnostic regarding the properties of the god or gods that they believe in.
This glossary of philosophy is a list of definitions of terms and concepts relevant to philosophy and related disciplines, including logic, ethics, and theology.
The problem of religious language considers whether it is possible to talk about God meaningfully if the traditional conceptions of God as being incorporeal, infinite, and timeless, are accepted. Because these traditional conceptions of God make it difficult to describe God, religious language has the potential to be meaningless. Theories of religious language either attempt to demonstrate that such language is meaningless, or attempt to show how religious language can still be meaningful.
Implicit atheism and explicit atheism are types of atheism. In George H. Smith's Atheism: The Case Against God, "implicit atheism" is defined as "the absence of theistic belief without a conscious rejection of it", while "explicit atheism" is "the absence of theistic belief due to a conscious rejection of it". Explicit atheists have considered the idea of deities and have rejected belief that any exist. Implicit atheists, though they do not themselves maintain a belief in a god or gods, have not rejected the notion or have not considered it further.
The following outline is provided as an overview of and topical guide to atheism:
Atheism, in the broadest sense, is an absence of belief in the existence of deities. Less broadly, atheism is a rejection of the belief that any deities exist. In an even narrower sense, atheism is specifically the position that there are no deities. Atheism is contrasted with theism, which in its most general form is the belief that at least one deity exists.
Agnostic atheism or atheistic agnosticism is a philosophical position that encompasses both atheism and agnosticism. Agnostic atheists are atheistic because they do not hold a belief in the existence of any deity and are agnostic because they claim that the existence of a divine entity or entities is either unknowable in principle or currently unknown in fact.
Possibilianism is a philosophy that rejects both the diverse claims of traditional theism and the positions of certainty in strong atheism in favor of a middle, exploratory ground. The term was invented by Robbie Parrish, a friend of neuroscientist David Eagleman who defined the term in relation to his 2009 book, Sum: Forty Tales from the Afterlives.
The term New Atheism describes the positions of some atheist academics, writers, scientists, and philosophers of the 20th and 21st centuries. New Atheism advocates the view that superstition, religion, and irrationalism should not simply be tolerated. Instead, they advocate the antitheist view that the various forms of theism should be criticised, countered, examined, and challenged by rational argument, especially when they exert strong influence on the broader society, such as in government, education, and politics. Major figures of New Atheism include Richard Dawkins, Sam Harris, Christopher Hitchens and Daniel Dennett, collectively referred to as the "four horsemen" of the movement, as well as Ayaan Hirsi Ali until her conversion to Christianity in 2023.
Articles related to philosophy of religion include:
God in the Age of Science? A Critique of Religious Reason is a 2012 book by the Dutch philosopher Herman Philipse, written in English and published in the United Kingdom. Philipse found his Atheist Manifesto (1995) to be too hastily and superficially written, and decided to set up a more complete work to systematically refute all the arguments for the existence of God and adherence to any form of theism.
