If anyone has killed one person it is as if he had killed the whole mankind (5:32)
Both books oppose killing, and then condone it in other parts.
The difference is Christians have, for the most part, adapted to the modern world, while hardcore Muslims are stuck in the Bronze age.
I will say that Muslims have a much more realistic view of who Jesus may have been. To them he was a prophet, not a cosmic man-god involved in some bizarre ritual sacrifice to atone for sins. They don't even believe he ever said he was the son of God. He is definitely a holy figure to them though, which is more than what most Christians think of Muhammad.
Yeah..... And you can talk all the trash you want about Christ and you won't get beheaded, but post a picture of Muhammad and you're put on an international hit list. There's nothing about Islam that I can give a thumbs-up to. If Christians want to believe Christ was son of God, why should you care? They aren't going to kill you because you don't believe. They might preach to you and thump their bible and tell you you're going to hell but you don't have to lose any sleep over any of that since you don't believe any of that.
What the scriptures say.... that's for the religion to sort out what's what and that's what they've done. The religion is responsible for the behavior it promotes or suppresses and the scriptures are just part of the religious landscape, but not the "religion", per se. Some take scriptures literally. Some don't. Some seem to make it up as they go along. The real proof of a religion is in what people preach, teach and believe.