not believing in god
atheist
agnostic (uncertain)
nontheist (neutral term)
unbeliever (archaic)
heathen (derogatory)
atheist
Core
unbeliever (broad) freethinker (rationalist) infidel (archaic) heathen (pejorative) pagan (pejorative)
Denial of gods
godless (adjectival) irreligious (broad) nontheist (neutral) antitheist (opposed) secularist (civic) secular humanist (positive)
Belief stance
agnostic (uncertain) skeptic (doubtful) materialist (philosophical) naturalist (philosophical)
Pejorative
heretic (hostile) apostate (religious) blasphemer (religious) sinner (religious)
Collective
atheists (plural) atheism (doctrine) atheistic (adjectival) irreligion (state)
atheist
unbeliever freethinker secularist agnostic (nuance) infidel (archaic) heretic (nuance) heathen (pejorative) pagan (nuance) skeptic doubter disbeliever apostate (nuance) rationalist humanist materialist naturalist nonbeliever irreligious godless unchurched
American Atheists Freedom From Religion Foundation Atheist Alliance Secular Coalition Humanist Association Rationalist Association
atheism secularism agnosticism nontheism antitheism irreligion freethought skepticism rationalism naturalism secular humanism unbelief disbelief apostasy blasphemy (nuance) anticlericalism (nuance)
problem of evil omnipotence paradox lack of evidence invisible unicorn Russell's teapot Flying Spaghetti Monster (parody) no true Scotsman (nuance) burden of proof Occam's razor
scarlet A Darwin fish atom symbol out of the closet (idiom) come out (phrasal) "there is no God" "good without God" "one less god" (quip)
theist believer theism deist (nuance) devout pious faithful religious creationist fundamentalist evangelist apologist
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