Dean Zimmerman has made significant contributions to metaphysics, philosophy of time, and philosophy of religion. In this paper, I set my focus on Zimmerman’s approach to God, time, and creation. Zimmerman has defended a model of God called open theism on which God is essentially temporal. In this paper, I will first articulate open theism. Then I will explore a series of puzzles related to God’s perfect rationality and creation. These can be stated as the following three questions. Why didn’t (...) God create sooner? Why did God create anything at all? Why did God create this universe in particular? (shrink)