God is a character, a real and consistent being, or He is nothing. If God did a miracle He would deny His own nature and the universe would simply blow up, vanish, become nothing.
All God's children are not beautiful. Most of God's children are, in fact, barely presentable.
I myself believe that there will one day be time travel because when we find that something isn't forbidden by the over-arching laws of physics we usually eventually find a technological way of doing it.