As with many facets of life, theism and atheism lie on a spectrum rather than a strict binary. Richard Dawkins popularized the idea of a spectrum of theistic probability in his book, [*The God…
- Strong theism, which asserts that the believer knows without a doubt there is a God.
- De facto theism, where believers are not 100 percent sure that God exists but consider it very probable and live their lives as though he does.
- Weak theism, where a believer isn't wholly certain but leans toward belief in a deity.
- Pure agnostic or complete impartiality, where the likelihood of a god's existence is just as likely to be true or false.
- Weak atheism, where an individual isn't certain whether God exists but is inclined toward skepticism.
- De facto atheism, where a person is not wholly positive that God does not exist but considers it very improbable and lives his/her life as though there is no deity.
- Strong atheists, who believe with 100 percent certainty that there is no deity.