Meatball man is right: He (God, not Meatballman) is eternal. While this of course sounds like a copout to a non-believer or skeptic, I don't think it is. It doesn't take much thought to come to the conclusion that there HAD to be an uncaused cause. Somewhere, somehow, something exists or existed that was never created. Some say our universe itself never had a beginning, other theories include timeless other dimensions that created this one. Christians believe it is God. Given the options, saying that God is an uncaused cause is at least as plausible as anything else we've come up with.