Bit broad really. You might want to focus on e.g. a specific issue/area of the philosophy of religion, or a specific philosopher/text.
That said you seem to be conflating "philosophy of religion" with "religious beliefs". The philosophy of religion is general and abstract, and not specific to an individual religion - it's philosophy about religion, as I understand it?
If you want to write about the (philosophical) beliefs of particular religions, then just be aware searching for sources on "the philosophy of religion" may not give you what you are looking for!