This isn't really a religious debate thread, but I can guarantee that Catholicism is indeed Christianity. Just because some families are on auto-pilot when it comes to their practices, does not mean it is any less, a form of Christianity, perhaps, the first fully established form of Christianity. The same goes for the Eastern Orthodox church. I was a practicing Catholic Eucharistic Minister out of respect for my families traditions, and I promise you, there is just as much teaching about the ways to heaven in Catholicism, as there is in any Christian faith.
But whatever... I really don't care. I have been agnostic for 5 years now.