No, I'm talking about how many people have a formal religion as part of their identity whether it is Christion, Muslim, Jewish, etc. It is much more than just gathering and worshipping as a community.
Religion is a set of beliefs in which an individual most closely identifies, and also relates something about self. I have lived most of my life in California. The years I lived in the mid-west and Texas, I learned to say I was born in Idaho, not that I grew up in California. The reason for this is that many people a stereotypical view of California based on the beach, L.A., and Hollywood, that it said nothing about someone who lived in a small town in northern California. "Idaho" was the more apt description of me.
"Catholic" also describes me to people who know Catholics. For those who hold a bias against Catholic, it tells them nothing about me, but it tells me something about them--so it all works out.
Our professions also are a quick summary of self. But do we have to have a profession as part of our identity? No. But people usually do.