A well-known British atheist philosopher, Anthony Flew, has opened his view from atheism to theism.
Here is one small exchange with a colleague of his:
HABERMAS: Tony, you recently told me that you have come to believe in the existence of God. Would you comment on that?
FLEW: Well, I don't believe in the God of any revelatory system, although I am open to that. But it seems to me that the case for an Aristotelian God who has the characteristics of power and also intelligence, is now much stronger than it ever was before. And it was from Aristotle that Aquinas drew the materials for producing his five ways of, hopefully, proving the existence of his God. Aquinas took them, reasonably enough, to prove, if they proved anything, the existence of the God of the Christian revelation. But Aristotle himself never produced a definition of the word "God," which is a curious fact. But this concept still led to the basic outline of the five ways. It seems to me, that from the existence of Aristotle's God, you can't infer anything about human behaviour. So what Aristotle had to say about justice (justice, of course, as conceived by the Founding Fathers of the American republic as opposed to the "social" justice of John Rawls (9)) was very much a human idea, and he thought that this idea of justice was what ought to govern the behaviour of individual human beings in their relations with others.
HABERMAS: Once you mentioned to me that your view might be called Deism. Do you think that would be a fair designation?
FLEW: Yes, absolutely right. What Deists, such as the Mr. Jefferson who drafted the American Declaration of Independence, believed was that, while reason, mainly in the form of arguments to design, assures us that there is a God, there is no room either for any supernatural revelation of that God or for any transactions between that God and individual human beings.
Here is a link to the piece, which I find compelling:
http://www.biola.edu/antonyflew/index.cfm