Atheism is rejection of faith-based doctrine

This is atheism in a nutshell

Theist: I know what the higher, divine will is, and you would do best to follow it

Atheist: No, I don't think so

Theism is to use religious faith as a basis for doctrine. It is right there in the name: the-/theo- for:, from god/from faith, and -ism, simply meaning doctrine.

A-theism is indifference to such doctrines. Anti-theism is active opposition against such doctrines.

So there is no dogma here at all, it is just that the atheist is not swayed by religiously inspired arguments.