We humans have a tendency to trust what our parents and other authority figures tell us. For the most part, that's an evolutionary plus, since it keeps us out of harm's way. Unfortunately, some things need to be questioned, particularly when they just don't mesh well with logical thought or clear observations of the world.
While this isn't the typical fundie drivel, it does echo some of the points that we often see quoted on this site, though in a much more polite and intelligent manner.
1) The idea that Christianity is somehow separate from religion. Why do I get the feeling that that sentiment arose in response to the separation of church and state issue? It seems like some kind of cheap loophole that they think they have found. "Surely the government would never outlaw people from talking about their relationships in public, right guys?" While I have known many Christians who see their religion as a personal relationship, they nevertheless admit that it is, in fact, a religion as well.
2) Religious people in general, not just fundamentalist Christians, seem to have a difficult time understanding how other people can be just as wholly devoted to a different religion as they themselves are to their own. Many zealots will proudly claim their beliefs as the only ones with any truth, and follow that by saying that anyone who believes in anything else is delusional. What they never seem to take into account is that the people across the pond probably feel the same way.
3) Many non-believers see religion as a crutch, a tool for those who can't seem to be happy otherwise. Although many people in the world apparently need such a crutch, that does not make the claims the religion spouts true. In other words, Christ doesn't necessarily exist because it feels good for you to believe in him.
Again, as has been said already, this isn't nearly as fundie as the majority of things that wash up here. It is, however, indicative of an unfortunate line of thinking.