Belief system, whether religion or not might incite but they don’t kill, people do.
In various books, Oxford University theologian Keith Ward argues that religion properly defined is an attempt to alleviate human beings from a condition of hatred, guilt, violence, lust, etc.
Its fairly obvious that for the majority of people it doesn’t achieve that. Christianity has another trick up its sleeve, however: original sin. This suggests that human beings are in a permanently fallen condition and only God’s grace can liberate them.
There’s been plenty of research on whether religion harms or helps people, personally I’ve noticed no real difference between believers and non-believers, except at the extremes: in religion, the bad people tend to be very bad (often attracted by religious Judgementalism) but the good people tend to be very good and selfless.