I also don't hope they stay around. They are an example of the elements I find most misguided among my coreligionists. I wish the zombies would help them to laugh at themselves and stimulate them to reassess how their work relates to God's message. Probably won't happen, but I can hope . . .
I think we had better be very careful if we are trying to claim that the "Nazis were generally Christian in nature." Nazi ideology was actually quite contemptuous of religion in general, and Christianity in particular, especially in the early days of the Nazi movement. They borrowed much more from Nietzsche's atheistic philosophy than from the teachings of Luther or the Pope. There was a point in time where they toned down their anti-religious rhetoric to achieve greater electoral success--it was useful not to completely scare voters with strong Christian sympathies. Then there was a point where they were in position to crush all opposition, which forced the major religious denominations of Germany to choose between being persecuted and coming to an accommodation. Church authorities (both Catholic and Lutheran) chose the latter, and it turned out to be a disastrous moral compromise, deligitimizing the Church in the postwar period. (It is easy for us, sitting in a place where we aren't at risk of being imprisoned or killed and having an institution we cherish persecuted, to blame the Church authorities, and in retrospect, we might say they were wrong, but in reality few of us would have been brave enough to openly oppose the Nazis once they began using violence to cement their hold on power). Some individual believers, though, did not go along with the Church authorities, acting on their beliefs by joining resistance movements, covertly
aiding Jews and other Nazi victims, or sticking their necks out for their beliefs and becoming
martyrs.
Antisemitism
is unfortunately, part of the Christian heritage, and the Nazis used antisemitism in their propaganda because it resonated with non-Jewish Germans at the time. It was a longstanding part of German culture (just like anti-African racism is in ours), and Luther, like most Germans of his era, was very antisemitic. That doesn't mean the Nazis thought of themselves as Christians, though--they were just manipulating common attitudes that were shared across a broad spectrum of German society, including ordinary Christians, to gain their political ends. You won't find very many Christians today who subscribe to antisemitism, at least not in the sense of a racial hatred of Jews, though it is fair to say that different elements of the Christian community have very complex and not always positive attitudes toward Judaism as a religion.
I'm going to avoid engaging in a longer apologetic for Christianity by noting that most big identity groupings that are coupled with institutional power--nations, religions, races, and so forth--have black marks on their historical records. Our pasts affect us, but we are not our pasts. Americans today are still affected by the historical consequences of slavery and "manifest destiny," but that doesn't make today's America or Americans evil. We continue to struggle as a nation with our mistakes, try to rectify them, and move forward. And there is much good mixed in with the bad--democracy, religious tolerance, a drive for equality for people of all kinds. The same should be said of Christianity--if you're going to bring up the inquisition, you also had better bring up pacifism; if you are going to complain about Pope Benedict's background or the Catholic Church's reprehensible cover-ups of child molesters in the priesthood, you should also remember Father Damian's selfless service to the lepers of Hawaii and Albert Schweitzer's work in Lambarene and his joining forces with Albert Einstein and Bertrand Russell to oppose nuclear testing and nuclear weapons. Christians are human, just as Americans or Muslims or Chinese or atheists or Brazilians are, and they do good and bad things as a group and as individuals, just as those other groups do. The ideals aren't necessarily flawed, just the institutions (and the understandings of the people) that carry them out.