Is there a connection between adherence to a religion and the amount of violence you are willing inflict upon others? At face value, at interesting piece of research from the Pew Research Trust seems to suggest, yes (see the link below for the full report 91 pages long!) The report does report on violence of various religions upon people of other religious and on non-religious people. However, it also covers violence against religious people. Because of their relative sizes Christianity and Islam have the largest numbers of adherents having violence perpetrated against them.
I did read the whole report and did not find one reference to Christians perpetrating violence against other. Almost all were describing violence upon Christians. Turn the other cheek (Matthew 5:39)