On first blush you would 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 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.
These discussions are important because secular thinkers too have a spiritual side. So if we go to some of these religious websites and review their discussions with a critical eye we can gain a lot of valuable information.
Religions can offer some deep insights about mankind’s spiritual nature because they have been studying it for hundreds/thousands of years.