You're asking such a loaded question just "out of curiosity," are you? Not for specifically Christian purposes? Did you learn that technique of fake nonchalance at Bible camp?

Assuming your premise is that it's the god of Christianity that exists, I might ask him why he created a world, hid from it, and punished most people for having tried to carry on without the God that plainly wasn't there. I'd ask him why he has to be such a monster that only a Christian could love.