I had a professor make that exact argument... or perhaps he was quoting an argument of one of the greats. Anyway, the argument goes like this:

• if there is evil, and god has the power to stop it, but he doesnt due to his knowledge, then he is not omnicient
• if there is evil, and god has the power to stop it, but he doesnt and he has all knowledge, then he is evil
• if there is evil, and god does not have the power to stop it, then he is impotent

The first person then smugly smiles that they put God into a box and waits to hear the mental gymnastics from the Christian Philosopher.

The christian philosopher then brings up a few points that were straw manned:

• incomplete understanding of whether what we are seeing is "evil"
• the illusion of choice - are we simply clocks that were preprogrammed back when the big bang occured? Can a clock have "evil" within it?
• moral agents with ability to make meaningful choices - The actions of the omnipotent being (God) are tied by pesky rules regarding choice because the being (God) could eliminate choice: the being could choose the perfect stimuli to create an exact copy of an ideal AI in a bio-mechanical body instead of moral agents who choose to be a dick or not. Therefore, if this fact pattern is reality, then there must be "something special" about being a moral agent and having a relationship albeit distant with an Omnipotent being.

The philosophers then keep asking questions to reduce the opponents argument until they conclude with the following question: "What is?" then they leave as friends.