It’s a good question: If humans have a built-in propensity to believe in God, then why are there atheists?  And even among believers, why are there so many different kinds of beliefs about the supernatural?  If God has made us with this propensity to believe in him, then why doesn’t everyone believe in him (and in him only).  Surely this is evidence that there really isn’t a “God faculty” or a sensus divinitatis, doesn’t it?