The difference is that there aren't Christian extremist groups going around beheading people in the name of the old testament. Actions are more important than written text, and Islam has shown it's actions in modern days are horrific, and tolerated by moderates at high levels.
So what you are saying is, once I have found some Christian fundamentalists killing in the name of their faith we can agree Christians are exactly as bad? No matter how fringe, low-number compared to the total adherents of the faith and compatibility with more widely accepted teachings of the faith?
Because in that case some
Norwegian dude immediately comes to mind. I'm pretty sure with some minuscule effort one could find some interesting samples by just focusing on, say, attacks on abortion clinics or people who work there. Normalized over history most religions (and certainly both Christianity and Islam) have so much blood on their hands that it does not matter. I'm not interested in arguing who is worse when picking a sufficiently adjusted temporal window to sample current events.
The problem is not Islam, the problem is religion in politics and politicians using religion to further their own interests. Well, and religious whackjobs.
You mean something like this: https://en.wikipedia.org/wiki/Christian_terrorism
What I see are
Central African Republic:
Central African sectarian violence that's a backlash of Christians killing Muslims because of Muslim terrorist attacks.
India:
An extremely small group of Christians has carried out around 4~ attacks since the 90's, and has been unanimously condemned by fellow Christians.
A group that killed 1,000~ people over a 1 year period, then declared peace with the government in 1993, and hasn't been a problem since.
A group of 15 people that tried to Convert Hindus and killed no one.
Lebanon:
Not too sure about these events, but it seems like a Christian militia tried to fight government forces. The PLO counter-attacked and killed many more.
If anyone can summarize that one better/knows more about the issue, feel free to offer a different interpretation.
Uganda:
They're not a Christian group... I'm not sure why this one's on here
A quasi-religious movement that mixes some aspects of Christian beliefs with its own brand of spiritualism, it is led by Joseph Kony, who proclaims himself the spokesperson of God and a spirit medium, primarily of the "Holy Spirit"
United States:
Several attacks which killed 0-1 people, several abortion clinic bombings that were done when no one was in there, to avoid hurting people.
So around 1-2k~ casualties max, with the vast majority being done in unstable territories... Meanwhile
https://en.wikipedia.org/wiki/List_of_Islamist_terrorist_attacks
https://en.wikipedia.org/wiki/List_of_terrorist_incidents_linked_to_ISIL
That isn't even a comprehensive list, as many Muslims terrorists don't profess an ideal before suicide bombing.
It's also worth noting that Christians who do these killings enjoy virtually no support from the local populations, unlike Muslim attackers who can have double digit support in the region.