Fairies, Sorcery, and the Titans

This book is about a guy named Jack who was touched by the hand of God and given the powers of the Greek Gods to stop an ancient war between the Gods. Merlin is his teacher. Yes, Merlin is 10,000 years old, but with the fairy dust, he does not age. In this book, the mother of the Gods, Gaia, an Angel, takes human form. Now Zeus and Poseidon are working with them. Jack goes down into Purgatory to help get Hades back in power so the souls start flowing again, and he owes him a favor. Odin, the Nor