The answer

I took a walk around the lake with God. I wasn't saying anything.

God said, "You seem troubled."

I said, "I'm sorry, it's just that every time we get together I spout an endless list of things I want from you. I'm so sick of begging."

God said, "Oh, you don't need to worry about that. I never listen to you anyway."

I said to God, "Then why do you go for walks with me?"

God said, "I need the exercise."