[tame_deuces]

Basically atheists don't believe in god(s).

There is some room for slightly different interpretations, some say there are 'weak atheists' (not in a bad way) who believe 'there probably isn't a god' and strong atheists who say 'there is no god' (sometimes called militant atheists when they aggressively push their views).

To confuse it further you have agnostics who would say 'there may be/not be a god, but I can't know for sure' who are often confused with weak atheists. This shouldn't be done because religious believers can also be agnostics - so it is broader concept.

Also you got some semantic issues - most atheists would not refer to their reasoning as 'belief there is no god', they would call 'having no belief there is a god', this point is often important to them as they don't want to come of as 'believers' in something.

Apart from that you will in discussions on this forum hear claims about other stuff atheists believe/don't believe/do/don't do, and that's all just plain old BS. Atheists have no bible, no same agenda and neither do they all have to be logical, reasoning materalists who only believe in rationality.