An Aside.Aside from which, 'perfect bliss' seems to rely on taking away everything that is 'You' and making one an immortal, eternal ball or orgasmic gas without a 'you' even there to enjoy it. Personally I can't see that as much better as Oblivion, which i what atheism offers.
This type of information is exactly the kind of information which causes confusion about atheism/atheist position.
As a position, Atheism simply does not have "the option of oblivion" on offer, as it is simply a state of lacking belief in gods.
In that, there is no reason why an atheist cannot believe in an afterlife situation where the belief in gods can still be lacking.
For example, an atheist could believe in an afterlife experience which involves being an immortal, eternal ball or orgasmic gas with a 'you' there to enjoy it.