I believe most people long to believe in something. It helps maintain focus if there is a backbone to what they are practicing. This is no different with Religion.
I believe you need to try something that fits you mentally first and foremost if you are the type to dissect something. If it gets results and satisfies you physically and mentally then I say "give it hell!". Other than that, I think this stuff is way too often over-thought.
The basics are what I think is most important and that is finding the right balance of a solid routine (whether it's someone else's or your own), good diet, and plenty of rest.