Here are the results of a survey of philosophers of religion specifically. It has lots of interesting data, among them:

• Most philosophers of religion are committed Christians.

• The most common reasons given for specializing in philosophy of religion presupposed a previous belief in religion. (E.g. "Faith seeking understanding"; "Find arguments in order to witness", etc.)

• Most belief revisions due to studying philosophy of religion were in the direction of greater atheism rather than the opposite. However, this seems to be explained by a combination of two separated facts: most philosophers of religion begin as theists as mentioned above, and most (from both sides) become less dogmatic and more appreciative of arguments for the opposing view with time.