If God is both omnipotent and omnibenevolent then there should be no evil in the world. The problem of evil is a philosophy that points this out, and refutes the western idea of God. God is described by many as omnipotent, omniscient, and omnibenevolent, but in this post I will only address the words omnipotent and omnibenevolent to be succinct.
Some respond that God allows evil as the means to an end, and that this end will be good. But this is still contradictory. In ethical terms, the thing that does the least bad and the most good is the best option. If God is omnipotent, he can do anything, and if he is omnibenevolent then he will want the best thing. If he is both then he will do the best thing.
But the problem of evil says nothing about the existence of a creator. It only shows belief in an omnipotent and omnibenevolent god to be irrational. This could mean that we were created by a omnimalevolent god, which I find unsettling, but I doubt this because we still have the opposite contradiction, the problem of good.
So the possibilities after accepting the problem of evil are this:
There is no God
God is omnipotent but neither omnibenevolent or omnimalevolent
God is omnibenevolent but not omnipotent
God is omnimalevolent but not omnipotent
We lack the language to describe God’s nature