Of course he isn't peaceful by modern standards, but at that time he (if he really lived) preached some nice thing (and some bad ones, like you should not wash your hands), which wasn't the standard in that area in that time period.
I'm pretty sure the golden rule existed before Jesus.
https://en.wikipedia.org/wiki/Religion_in_ancient_Rome
Roman religion was practical and contractual, based on the principle of do ut des, "I give that you might give".
Yes, he (allegedly) did say that, but never expanded upon it. But he also (allegedly) said this:
"You have heard that it was said, "An eye for an eye and a tooth for a tooth." But I say to you, Do not resist the one who is evil. But if anyone slaps you on the right cheek, turn to him the other also. And if anyone would sue you and take your tunic, let him have your cloak as well. And if anyone forces you to go one mile, go with him two miles. Give to the one who begs from you, and do not refuse the one who would borrow from you." (Matthew 5:38-42)
It turns out that both religions (in fact, pretty much all religions) preach both tolerance and violence. Go figure.
Jesus didn't massacre a town full of people and kept only the woman children to themselves, Muhammad and his people did. There are great videos on it, comparing Jesus and Muhammad.
The thing is though, Jesus is but a part of the holy trinity. So Jesus is also God, God's actions are Jesus' actions. God has committed any number of atrocities up to and including wiping out almost all of humanity.
As far as I know, Muhammad doesn't claim to be God. He's just a dude, albeit a special dude that God talks to. His atrocities are his own.
If you want a religion that only uses the New Testament, and sticks to only the best parts of it, you might have to found that religion yourself. But it's not Christianity.
But the judicial systems are free in those other countries (at least in the European ones I know). They do not use ancient christian punishments from the middle ages. No stoning, no burning at the stakes, no cutting of body parts.
Any particular reason why you find those punishments objectionable? Not into physical violence?
IMO, judicial systems can use what punishments they like as long as they're consistent about it. I have my own preferences for what punishments are appropriate for various crimes, but stuff like losing a hand for theft it has a certain poetic ring to it.
Pain and bodily damage is also probably the most universal and egalitarian punishment available. A whipping hurts the same no matter how rich or powerful you are, and while some day you may be able to buy a legitimate replacement for a finger, we're not there yet. I'd suggest that it's very much to the benefit of those with wealth and power that there not be physical punishments, as those are the the ones that they'd struggle to buy their way out of.
It concerns me far more when judicial systems are corrupt and laws are applied injustly than when they use punishments that happen to be squicky.
Even in the USA where the death penalty is legal they do it with injections. Why is there a difference, explain that to me then!
The funny thing about those injections, they're basically cruel and unusual torture.
https://www.theguardian.com/tv-and-...ethal-injections-horrifying-and-unpredictable
I suggest you watch the actual Last Week Tonight episode itself if you can. It makes the electric chair look humane.