Why belief in God casts doubt on all atheistic beliefs

If fundamental and widely-held beliefs are selected by evolution not because they are true, but rather because their falsehood confers a survival advantage, shouldn’t we expect any and all beliefs (including scientific and atheistic ones) to be possibly false in the same way?

Freedom & virtue: coping mechanisms for atheists

Are atheists two-faced for criticizing religious belief as a “crutch”, when they themselves believe in a purely physical universe that includes freedom and virtue?