Good question, but you'll never find a logical answer, since "god" is a myth. Just live your life the best you can, and have a blast. If there's anyone worth believing in, it's yourself. And one of your greatest rights is to not give a crap about what anyone else thinks of you.
A very interesting aspect to your thoughts though, is that if you had grown up in lets say a northern European country, you would not have them.
Religion is a local phenomenon. Your location of birth and your family's ideas decides how you'll grasp with your own existence. No one is born religious. Perhaps more likely to believe in fairy tales though.. Indoctrination at it's finest.