Nono, it's not a strict dichotomy like that. You don't have to be one or the other. It's not a trichotomy, either.
For the purposes of this discussion, you can think of religion as a type of politics, along the lines of what blacksmith proposed, since we're talking about the aspects of religion used to direct people to make certain decisions/actions.
Religion is also not directly opposed with science. You can interpret religions as an early way to explain why things happened. Science is a systematic or organized way to explain why things happen. The two are not mutually exclusive. You could have religious scientists studying various sacred texts and records and comparing them with natural phenomena(Aha! We conquered the barbarians! Only a divine people could have done this, so we must be descended from gods!) and investigating why said phenomena occur, and that counts as performing science. For a more concrete example, consider why religious entities have some of the largest archives/libraries.