1, Then they werent Christians. The Christian Bible states many times over that murder is wrong, (and don't you dare quote stonings of the old testament, this is Christian Bible, not Jewish Torah, and such things were stopped by Jesus) and therefore these people murdering scientists were not following the bible, and Christians follow the Bible. And as for the whole Muslim thing, whereas the Bible forbids murder and such, the Koran ACTUALLY has a verse (not sure which because, im not a Muslim) that states they should kill everyone who wont convert to islamic ways. This is where terrorist groups get their inspiration, although modern "non-radical" Muslims will not acknowledge and most likely have censored such things, when I see Muslims in America protesting outside of Military Bases with signs that say "Death to Israel", i'm not very conviced :/
2. Again, similar to 1. Besides, I highly highly highly doubt that people who kept other people in those conditions were very much Christian.