Old Testament was written in Hebrew and Arameic.
New Testament was written in Greek.
I agree on the translations' issue and I'd like to add that according to the research, the story was written down many years after Jesus' death. It simply was passed from mouth to mouth.
Existence of multiple religions speaks against existence of God in itself. If God really wanted to pass a message to people, it would simply make everyone heard, I mean - every single person living that time. God is enough powerful, I suppose, to perform that trick. So what's all farce about the Bible, Koran and other scripts? It was the tool of getting power over people and since that time the idea of different gods and different super powers was popular and well accepted, it was the easiest way for any leader to use this idea to establish its power.
What about all miracles and healers and wonders in this life? Hmmm .. what about electicity, heart transplantation, black holes and a man walking on the Moon? Show that to anyone 1000 years ago and be their new god. What do I want to say by this? We learned and discovered many interesting things during the centuries and we will continue our research because we will always want a goddamn good explanation. That's in our nature, isn't it?
If to measure in centuries, religion is singing its last song. It simply won't be able to correspond to the modern societies so sooner or later any religion will loose any sense at all. We are evolving intellectually too and our morality doesn't necessarilly need to be based on religious teachings. We can be good, kind and helping not because God said this and that and we are afraid to be punished by it, but because that's the only way to experience the joy of life. Positive emotions are very good natural stimulators. I know, I didn't say anything new. People have known that for centuries.
Adds:
Sorry, forgot about the initial subject. Execution is a one-way road. It can't be undone. If by a mistake a person who didn't do THAT gets executed, we can hardly speak about any justice at all. It's another murder in the name of justice and God and whatever.
It's a huge dilemma for many juridical structures - how do deal with mentally retarted people and psycho cases.