i think we have to put aside all the philosophy and ideology of either atheism is religion or not, because i can't see this thread is coming to a conclusion. Let's talk about the mechanic of atheism inside the game instead.
before that, read the thread's title properly first: Atheism as Religion. I hope nobody make unnecessary squabble after this.
IF the atheism is taken as a religion in the game, then they should have no boosts, since the game creator want to treat ALL religion equally. There are no boosts, nor drawbacks in each religion in the game.
This will bring us back to a discussion whether ANY religion should be added or not, like the thread about GRP religion should be there or not (and various other thread). One of the thread came to a conclusion that the game creator thinks that 7 religion is enough for the sake of the game balance.
Another point is, IF atheism is to be taken as a religion in the game, it should have what other religion have: Holy City and its shrine, Cathedral of some sort, temples and monastery; which, is quite strange since they don't have any gods nor prophet to dedicate them to. What would it be? give me a real name of a cathedral for or shrine for the atheist to attend to that really exist on this beautiful earth. I believe none can answer to that
. Keep in mind that library or laboratory cannot be the temple or cathedral since temple or cathedral have to be in the religious context of the game.
I understand that the shrines is where its follower do their pilgrimage of some sort. And the cathedral is somewhere the follower would congregate, especially on celebrations. Is there any atheist that think they have to go on pilgrimage, and congregate when the cathedral calls? I believe that's another no.
It would be peculiar if atheism should be in the game. Even if you can name the cathedral or shrine of atheism, it would just be another religion in the game. There's enough religion to make the ai's chop each other's head off.