Earlier quoted context omitted.
I was called hakujin once, by a very angry man--"iranai, hakujin ga kirai" was the exact greeting. Granted, I was a Mormon missionary knocking on his door to talk spirituality, but out of the thousands of doors I knocked, that one still stands out as pretty spicy. In comparison, gaijin never seemed that bad.
What makes people like you think it's a good idea to go and bother people in their home about your religious beliefs? Many people must find it frightening or just very annoying. Why subject people to that? It doesn't seem nice, let alone Christian.
If Christians truly believe nonbelievers are going to hell, it's the only loving response. The magician (and atheist) Penn has a great story about this [0].