On first blush secular thinkers might think that studying religions is a waste of time because they are all based on false Gods. But if you go one layer deeper and consider that these false Gods were created by their underlying societies, then you see them in a different light. Studying religions, especially their scholars, is actually a study in history, sociology, cultural anthropology, and human nature.
Religions are concerned about the spiritual nature of man. There are few if any secular resources discussing the spiritual nature of man. But there are numerous religious resources holding those discussions.
Religions can offer some deep insights about mankind’s spiritual nature because they have been studying it for thousands of years. So if we go to religious websites and review their discussions with a critical eye, we can gain a lot of valuable information.