Popularized by Richard Dawkins in The God Delusion, the spectrum of theistic probability is a way of categorizing one's belief regarding the probability of the existence of a deity.
J. J. C. Smart argues that the distinction between atheism and agnosticism is unclear, and many people who have passionately described themselves as agnostics were in fact atheists. He writes that this mischaracterization is based on an unreasonable philosophical skepticism that would not allow us to make any claims to knowledge about the world. He proposes instead the following analysis:
Let us consider the appropriateness or otherwise of someone (call him 'Philo') describing himself as a theist, atheist or agnostic. I would suggest that if Philo estimates the various plausibilities to be such that on the evidence before him the probability of theism comes out near to one he should describe himself as a theist and if it comes out near zero he should call himself an atheist, and if it comes out somewhere in the middle he should call himself an agnostic. There are no strict rules about this classification because the borderlines are vague. If need be, like a middle-aged man who is not sure whether to call himself bald or not bald, he should explain himself more fully.
In The God Delusion, Richard Dawkins posits that "the existence of God is a scientific hypothesis like any other." He goes on to propose a continuous "spectrum of probabilities" between two extremes of opposite certainty, which can be represented by seven "milestones". Dawkins suggests definitive statements to summarize one's place along the spectrum of theistic probability. These "milestones" are:
Strong theist. 100% probability of God. In the words of Carl Jung: "I do not believe, I know."
De facto theist. Very high probability but short of 100%. "I don't know for certain, but I strongly believe in God and live my life on the assumption that he is there."
Leaning towards theism. Higher than 50% but not very high. "I am very uncertain, but I am inclined to believe in God.
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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 no deities. Atheism is contrasted with theism, which in its most general form is the belief that at least one deity exists. The first individuals to identify themselves as atheists lived in the 18th century during the Age of Enlightenment.
Ignosticism or igtheism is the idea that the question of the existence of God is meaningless because the word "God" has no coherent and unambiguous definition. The term ignosticism was coined in 1964 by Sherwin Wine, a rabbi and a founding figure of Humanistic Judaism. Ignosticism and theological noncognitivism are similar although whereas the ignostic says "every theological position assumes too much about the concept of God", the theological noncognitivist claims to have no concept whatever to label as "a concept of God", but the relationship of ignosticism to other nontheistic views is less clear.
The God Delusion is a 2006 book by British evolutionary biologist and ethologist Richard Dawkins. In The God Delusion, Dawkins contends that a supernatural creator, God, almost certainly does not exist, and that belief in a personal god qualifies as a delusion, which he defines as a persistent false belief held in the face of strong contradictory evidence. He is sympathetic to Robert Pirsig's statement in Lila (1991) that "when one person suffers from a delusion it is called insanity.