There is a lot of room for all types of players. I do not wish to restrict player wishes when it comes to the existence of higher beings or the truth behind less mythical schools of thought. I figured, if you want to provide religious and secular philosophies, you cannot make individual tribes be solely this or that.
My solution is to provide many different approaches, and remind players to create their own belief system, if they think something is missing. I will present at least two approaches for all three tribes (religious and secular). The focal topic is always related to what Michtims from that tribe value the most. Nevertheless, it is absolutely okay to stick your character’s head into a different belief group. Go with what feels right.