All reality follows from physical law.
While we may not fully understand the formal system underlying physical reality, it exists nonetheless. Christian All reality follows from God, who is timeless and transcendent, yet immanent. While I'm sure we couldn't quite fully express God's attributes, I would claim that God's self-knowledge is exhaustive. Trivially, there exists a formal representation of God's nature, though God may be the only being capable of apprehending it. Therefore God is no less a consequence of some formal system than we are.