
Unfortunately, I suspect that this Christian was not alone in believing that Christianity is somehow truer or less superstitious than any other religion, past or present. This is part of what makes religion dangerous: it fosters us vs. them mentality, imbues the "us" with divine authorization, and often dehumanizes the "them" by associating them with evil. "My god is better than yours" has been used to justify countless wars and continues to allow people to treat one another poorly while managing to feel good about doing so.
For the record, I'll note that I find Christianity preferable to Islam in some ways. Given the choice, I would rather live in a predominately Christian area than in a predominately Muslim area. Of course, I'd far prefer living in a predominately secular area to either. And while I do regard Christianity as preferable in some ways, this has nothing to do with it being any more rational, any more likely to be true, or any less superstitious.