They don't need to be "part of a branch of Christianity" to be Christian; it doesn't work that way. In fact, they represent a majority of (non-Catholic) Christ

They don't need to be "part of a branch of Christianity" to be Christian; it doesn't work that way. In fact, they represent a majority of (non-Catholic) Christians in America these days. The mainline Protestant groups (Lutheran, Episcopal, etc.) are dying out, and all the younger people are going to the independent evangelical Prosperity Gospel megachurches now. The Catholics are really the only serious exception.