The Christian denominations like Rome haven't been killing for centuries. Islam has never ceased from killing people.
Dec 30, 1997: Relizane, Algeria Islamists massacre hundreds of villagers,
including children: 272 killed.
In November, 2018, there were 159 Islamic terror attacks in 26 countries, 13 of them suicide bombings, killing 1,049 people and injuring 950 people.
Here is the list of attacks...
List of Islamic Terror Attacks
Now you tell me how man people "Christian Denominations" killed in that same time period!