There's more to it than that though. Christianity for example exists in multiple aspect in people's lives. The aspect you're talking about is the actual belief.

There's more to it than that though. Christianity for example exists in multiple aspect in people's lives. The aspect you're talking about is the actual belief. But there are other aspects. There is a set of traditions and ceremonies that people perform. There are the local communities. There is a set of values. Then there are the overarching organizations. And at the same time, there is a set of mental tools for reasoning about things that while they look like belief may not be. All of these fit into a ball of mud that can be called religion.