Not really. God is infinite and eternal. There has to be an uncaused cause and that is God.
Actually the question would be, “Has He revealed Himself?” Of course your question IrishB is obvious, unless you know that it’s turtles all the way down whatever position you take. If you did wonder where He came from, I doubt that would be the first question to someone who sincerely was convinced of His existence, but say it was the question, then just ask Him. But can we? Yes actually we can. And so it goes from there...