Richard Dawkins, in his recent book The God Delusion ultimately relies on the concept of a multiverse as the answer to the argument for the existence of God which is drawn from the fact that the universe is structured according to fundamental laws which apply across the whole universe.
The Templeton Foundation (incidentally, a pet hate of Richard Dawkins) sponsors research and discussion on the relationship of science and religion. Each month, the Foundation hosts and online exchange on some important question related to its mission. This month, the question is "Do we live in a multiverse". The dedicated page for the question has an interview with Paul Davies and links to several related articles.