There is no religion that is violent. I certainly know of no religion that teaches that killing or murdering is right or to oppress and illtreat others is acceptable.
Yes, no faith is violent and thus Islam by definition is not. What we experience is that some adherents of Islam perpetrate violence. But that is true of Christianity as well.
The Ku Klux Clan are not ashamed of using the cross revered dearly by most Christians as part of their insignia, and they then go forth to fire bomb and lynch blacks as a religious obligation.
It was Christian Germans who cooperated with Hitler in carrying out his final solution through the Holocaust.
It is Christians who are one another’s throats in Northern Ireland.
It was devout Christians who supported the vicious and violent system of apartheid and who claimed to have biblical sanction for that system.
The Oklahoma City bombers were inspired in part they claimed by their understanding of the demands of their belief.
Many of those responsible for the genocide in Rwanda were devout Christians.
Does all this make Christianity violent? No.
Some Christians may be violent, as also some Muslims, Hindu, Jews, etc. As Kofi Annan declared, it is not faiths that are the problem. It is the faithful.
God bless you.