It is absolutely acceptable to take extreme outliers of any given group to justify violence against all of them.
Then you either have misread the bible and focused on events in the OT(which happens often to those who nick pick at the bible) or you have been shown or taught a horrible and twisted form of Christianity. Either way I apologize. There are absolutely those out there who do have that view point so please dont think Im saying that.
Now as far as me believing that most Muslims are out to do harm to me or someone that doesnt agree with them, no I dont. First off, Ive read the Quran. By no means do I understand it all(I dont even understand everything in the Bible) but can understand how one can be misinformed by it if they are not taught how to read it correctly. I have visited a couple of mosques and have made several good friends by doing so. They have asked me questions and I have asked them. A couple of yrs ago, I volunteered to go with a group of firefighters, doctors, and others to a remote place in north Africa to help build and aid a couple of villages. While there, I witnessed a Muslim man being shot because he wouldnt answer truthfully, to a group of Muslim extremists, if there were Christians in the area. So yes out of those experiences, I believe what I said.