Should non-Christians trust Christians, since Christians have such an extensive history of violence?

Good Christians are seriously getting a bad wrap here. There are Christians today that are more God-like than Christ-like. They rush to judge others who are different or sinners (which all of us have sinned), instead of befriending them, talking to them and understanding them. It's true the old testament is filled with violence but the mistake modern day Christians make is dwelling on the old testament instead of focusing on the new testament where Jesus tells us to love one another. I don't hate Muslims for instance, they are simply people that are working hard and trying to raise their families. Being Muslim does not in itself make them a bad person, they are just different and different is ok. Where religion gets in trouble here for both Christians and Muslims are the people that go extreme with their religion. There are some Muslims that kill others but it doesn't mean all of them are bad. If that were true, by the same standards we would say that James Holmes (Aurora, CO) a Lutheran Christian, killing 12 people and wounding 58 was a bad person. Does that mean all Lutheran's are bad? Not at all, there are good and bad in all groups. A true Christian, who is Christ-like will focus on the similarities of another person and not the difference. Christ taught tolerance and I don't see it being practiced very much by the Christian churches. They're so stuck in the violence of the old testament they fail to embrace the changes brought about by Jesus sacrifice and his teachings in the NEW testament.