The problem of evil is enough to convince them that God does not exist others argue that the only wat we could know why an omnipotent, omnibenevolent god would allow evil is if we knew what omnipotent, omnibenevolent gods usually do, or if we were this god. As neither of these is possible, the reason why God allows evil and suffering remains a mystery, but our inability to know the reason does not mean that there is not a good one.