Interesting point, but I don't think so. Religious art, I believe, is more likely didactic. It's purpose is to teach some fundamental of the religion, or in many cases to instill in the viewer a religious sentiment or feeling. In the best case, it might instill in the viewer a religious epiphany or transformation. I would not call that commercial.
Originally Posted by 2F/2F
If it is used outside the church, then it could more more likely be commercial, intended to invite the viewer to enter the church. But once inside, I would not call most of the art commercial, but rather didactic.