I know, right? ...the "debate" should be about 10 seconds long.
The only counterexamples are from when the Catholics (not Christianity in-general) had effectively established, and brutally enforced, their own Theocracy.
Theocracy is always oppressive, with violence the ultimate and inevitable means.
Islam is a Theocracy, by design.
Christianity is an Individualist religion by design, it is about your personal relationship with God. The State has no role, whatsoever. As such, any measure of Theocracy, or indeed any measure of coerced participation at all... is not "Christian" in the first place.

Christianity, at its core, is nothing more than the attempt to emulate the persona of Jesus Christ.
Islam is similarly about emulating the persona of Muhammed.
Jesus was peaceful.
Muhammed was not.

People who claim to be Christian have done all sorts of things... probably anything you can imagine.
But they've done so because they're people... not because they're Christians. Any act that Jesus would not condone... is not Christian, by definition.