Re: "That's a flawed argument if ever I saw one."
"Er, yes it is. Whether or not Christians choose to adhere strictly to the old testament, it doesn't say stuff like "optionally you may, if you so wish, stone someone to death". It deals in absolutes. The fact that the new Testament lurches in the opposite direction, advocating forgiveness and some measure of tolerance doesn't change that fact."
Especially, according to Matthew, Jesus specifically noted that the old laws as laid down in Leviticus and so on still apply:
"Do not think that I have come to abolish the Law or the Prophets; I have not come to abolish them but to fulfill them. I tell you the truth, until heaven and earth disappear, not the smallest letter, not the least stroke or a pen, will by any means disappear from the Law (the Old Testament) until everything is accomplished." - Matthew 5:17-18
And the punishments laid down by the Torah were quite specific and explicit, so that supports the idea that the Bible, by its own admission, is brutal and misogynist at the very least.