I think it's nearly impossible to determine an American politician's true religious beliefs are. Politicians are very careful to craft an image of themselves, be it realistic or not, that they believe will get them elected. In this country that means portraying yourself as a Christian.
Even if the open windows of science at first make us shiver after the cozy indoor warmth of traditional humanizing myths, in the end the fresh air brings vigor, and the great spaces have a splendor of their own - Bertrand Russell