Lots of people refuse to believe in God because they simply don't like the way He is running things. "I just can't believe in a god that would allow suffering!".... "I won't believe in a god that would send anyone to hell!"... "I refuse to believe in such an arbitrary god!".... "I won't worship a god that says we should do this, and we shouldn't do that!".... It seems they would prefer a god of their own making. A god that does what they tell him to... rather than the other way around.