It's barbaric for sure, but isn't that Christian behavior? For starters, they decorate their rooms with a replica of the mangled corpse of their savior. Same with any cross symbolism, really.
That's Catholics. Christians use an empty cross to signify the resurrection. Either way, both use the symbol of Jesus crucifixion because according to the Bible, the crucifixion was the sacrifice Jesus made to provide forgiveness for a humanity that didn't deserve it, the very definition of grace. Unfortunately the actual message appears to be completely lost on a lot of people these days.
Yeah, the “sacrifice Jesus made.” I think the Romans had something to do with that. Maybe we should be thanking them for killing Jesus to save us from our sins.
According to the Bible, as the son of God, Jesus could have stopped the crucifixion from moving forward at any time. He allowed himself to be crucified as one final blood sacrifice offering to God. That's why Christians don't sacrifice animals on the altar anymore, the way that the Hebrews did, because it is no longer necessary thanks to Jesus' sacrifice.