Tell that to the muslims killed during the crusades and the witches burned during the inquisition. Christianity has a bloody history.
It is true that Christianity has a bloody history, full of crusades and killing, as do most mainstream religions. Though not a Christian myself, I am able to separate the acts performed in the name of Christ, from Christians in the present time.
While not wishing to be an apologist for Christians, a sincere attempt to live by the gentler aspects of Christ's original message can improve peoples lives.