A great example of a religious philosopher was Nietzsche who wrote "God is Dead" as a warning that declining faith could lead to rising immorality. Ironically, his fellow Christians have been failing to understand his message for over a hundred years, because they as a whole lack literacy, or morality.
He had a doctorate of philosophy. Also known as a PhD. All scientists are philosophers. Though if we're talking about philosophy as sitting in a room and thinking without using any evidence or math (which is untrue), then Einstein's breakthrough that a constant speed of light requires time dilation certainly counts as a philosophical contribution.