The wise men understood that this natural world is only an image and a copy of paradise. The existence of this world is simply a guarantee that there exists a world that is perfect. God created the world so that, through its visible objects, men could understand his spiritual teachings and the marvels of his wisdom.
God is one the paths to reach him (religions) are many - just as different rivers, originating in different mountains, traverse different paths, flowing straight or crooked, and at last join the ocean. He is the one Lord of all, the one Soul of all souls.
What I'm really interested in is whether God could have made the world in a different way; that is, whether the necessity of logical simplicity leaves any freedom at all.