Why does everything have to serve a purpose by believing in God? If we are endowed with free will and if our choices affect our salvation or lack of it that implies two things:
1) we are 100% responsible and accountable for our own actions. Is it not easier and more convenient to believe you are NOT accountable to anyone except yourself? I would argue that it is natural for people to believe in a higher power and the people who are afraid are in fact the atheists because they much prefer to go it alone. The alternative would force them to look beyond themselves.
2) there will be randomness. Bad things can and will happen by chance not because God is feeling peevish in that moment. This is hard for some people to accept and is representative of the more foolish of the believers who accept God (and the atheist who deny God because of this) but don't accept first item. Put simply you cannot have free will without allowing for the possibility of humans making a mess of things and the possibility that some things are no one's fault, not even God. Yes, God could prevent it, but then again most of the time so could we. We choose not to.
I'm always amazed at atheism because it completely ignores the overwhelming proof that there must be something eternal out there who directly or indirectly created all of this marvelous thing we call life. Life is ridiculously complex and to use a technological analogy--I could throw a bunch of copper and plastic and silicone in a pile and let it sit for a trillion years and I won't get so much a transistor out of it much less a working computer. Not saying evolution doesn't happen, just saying WE could never make it happen and neither could random change.