I don't agree with some of what he said but these point's stuck out.
- "Religion" is typically a "God Management System". Most of the religions around are ways of managing God. If we think about your typical pagan tribe who worships nature, the sacrifices and rituals are ways of managing their "gods".
- Christianity can become an idol. He states that anything that is not God is non-god. If something is non-god, it is a candidate for becoming an idol. While ideal Christianity is a good thing, there is really no such thing. The result is that Christianity can become a God management system as well. I believe that as a religion, Christianity has become the idol, the god of many.