I'm assuming that by capital A, versus lowercase a; atheists, you are trying to underscore the differences between people who understand that religion is a hoax but it doesn't affect me right now so I'll let it pass, and those who have been directly affected by religion and it's evils and see no other way but to fight it as hard as they push it?
I will try to explain why this is bad: engaging the mentally ill in their delusions is not only mean (you don't believe their crazy stories, so why listen to them?) it's bad for society as a whole, because this is a untreated mental illness that is totally treatable and it's being spread because people refuse to treat it as a mental illness and instead say, believe what you want.
why is it bad to allow the masses to remain ignorant?
you (hopefully) wouldn't teach your children that the world is flat, because you were educated against such teachings.
you wouldn't teach a medical student about the human body without allowing them to learn about the human body by cutting it open and studying it.
you wouldn't let your neighbor spray your yard with ddt (hopefully) because a higher being told him it was safe.
you wouldn't take advice from someone on the Internet without first researching the topic (we all do)
yet we'll freely entertain the insanity of religion because why? so many people believe it?
we all thought the world was flat, the human body was designed by God and shouldn't be examined, sprayed ddt right in our children's faces, and still take advice from strangers on the Internet without doing research because, we're sheep (hanlons razor).
it's all stupidity, and fear. we're all alone, there is no guidebook and we're so painfully self aware.
when you have No explanation, any explanation seems possible.
the world is not flat, but knowing we knew, was comforting.
anyways, what was I trying to get at?
don't let them in. keep them very far away from you.
if you want to help change the world, be proactive. openly challenge religious beliefs any time they are presented. it could get you killed. it will get you beaten.
but we all have a duty to further the human species, and putting us second to imaginary beings is not exactly the way to go about it IMO.