In order to make sense of this thread I have gone back to the beginning, where ādā stated:
ā I realized when you tell people that you are an atheist they get hostile especially family members I feel like what is the big deal if someone does not believe in God. ā
Perhaps the answer is that, birds of a feather flock together. In order to maintain an un-provable belief, it is essential that member of a group share a common - Group Identity. Anyone that does not demonstrate loyalty to the supported belief system, must be made to feel like an outsider. This acts as a warning to the rest of the group and encourages group thinking.