An aside: When I first came to Kansas, I taught in a small, rural, 4-classroom/8-grade level elementary school. When I heard we'd be having religion class in the middle of the day, I was enthused and told the nuns who came by to visit all about how I had divided my social studies classroom last year in Texas into six groups, with each group studying one major world religion. The nuns didn't say a word.
I was new to the school. Their religion class was taught to the Catholic children in my classroom; any non-Catholics (I had one Protestant) could remain in the classroom with me during that time. (This is how public education is tweaked in some rural settings, I came to learn.) I don't know what that one boy and I did during that time, but I do remember it wasn't religion. Maybe an extra art time?