The existence of religions are closely tied up to an unknown lying in front us. It closely concerns our lives but remains unknown to us. It is the question that, "whether life will continue after death".
There are 2 main camps of believes.
1) Life continues, there might be something series would happen
2) Life discontinues
Those with belief 2) don't have the necessity to continue to think about "what could possibly happen". Because "Life discontinues" leaves no room for the possibility of "what could possibly happen".
All religions (including atheism) branch out from these 2 camps. Ironically, there is no evidence showing that life discontinues. Of course, if life discontinues then no evidence will be available. However they choose (subconsciously) to neglect the possibility that life continues but not yet evidenced to humans.
As for camp 1), if life continues then what would happen? The two possibilities now are open to them. It is possible that nothing serious would happen, it is also possible that something serious would happen. They are possibilities in the perspective that it's unknown to us. Either of the two is thus a faith.
When it is said that "there's bomb nearby", we are facing the same 2 possibilities. It's possible that it's true, it's also possible that it's a hoax. If it's not a situation concerning our lives, it makes sense for us to stay in the area to investigate which of the two possibilities is more true. However "a bomb" is a life threatening situation, we should run disregarding which of the two is more true. Unless we have a more reliable source (say, the police) identified it as a hoax.
Camp 1) however, as influenced (subconsciously) by the "life discontinues" faith fallaciously conclude that they should stay until more evidence showing that it's not a hoax.
Atheism is such a religion with a large group of humans sharing a common belief.
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