If a child asked you about God, how would you answer?

"Don't worry about it."  Kids have better things to do with their childhood than be bogged down with huge, unanswerable philosophical questions that are constantly being bickered over.  Let them grow up first, then they can worry about God.  Otherwise, you will have doomed them to look upon God the way you told them to look upon God when they were impressionably little, instead of letting them figure stuff out on their own later on when they have the resources and ability to.