You practice a religion. It’s the same one I do. Regardless of your preferences, the term is useful for categorizing different belief systems.
Sorry, I don’t have a “belief system,” nor do I have a religion. Religion, in the traditional sense of the word, is the opposite of Christianity.
I realize it is a bit confusing (I can explain myself, and have on this thread), but the terms we use are very important, because they carry specific meanings and connotations.