Surprised there hasn't been more discussion as to the relationships between Judaism, Christians and Islam. Let's be honest, if there was one big family reunion the three would all be there.
But the differences came long after the Old Testament and the particular example on this thread was a good one not of how "bad" Christians are, but how a lack of knowledge can lead to faulty conclusions.
Anyway, I'm inspired by your post, Natural, to make what I think is a good point. Christ spent a lot of time essentially telling the Pharisees, the religious leaders of the day, to "get bent". If you think about it, he spent a lot of time teaching people to do what was right, not what they were told.
Back to our recent example (Old Testament) about stoning? I can think of one story where Christ kind of changed that up a bit.