Miller's metaphysics, including his approach to God, is broad, deep, and original, with the potential to make a fruitful contribution to contemporary philosophy. Yet it has not received the critical attention it deserves. Miller's work deserves critical attention because of its thorough and original defense of three highly controversial positions: that existence is a real property of concrete individuals; that it is possible to prove, without assuming any principle of sufficient reason, that there is an uncaused cause of the universe; and that the uncaused cause is the simple God of classical theism. Miller's position on existence is an important alternative in current analytical philosophy to what Miller calls the "Frege-Russell-Quine" theory, and the neo-Meinongian positions of Terence Parsons and Ed Zalta. Miller's argument for an uncaused cause of the universe has been described one of the most ambitious theistic arguments produced by a well-respected, contemporary, analytic philosopher. Analysis of Existing: Barry Miller's Approach to God is the first clear, systematic interpretation of Miller's theistic philosophy.