I must say, I have never been clear on why Christians don't feel obligated to follow the majority of the commandments, yet so many tend to be adamant that the Bible is the literal word of God. To me, that just seems self-contradictory; and the various exegetical and theological arguments I have heard advanced by Christian ministers and priests that I have heard seem deeply unconvincing to me.
It seems to me that if you are going to demand of others that they follow the commandments regarding sexual proprieties, marriage, and divorce, to say nothing of using the Torah texts as support for capital punishment and other conservative issues, then one ought to be keeping kosher, observing the sabbath, the festivals, the laws of impurity (e.g., menstruating women must keep to themselves, and any time a man has an emission of semen, he must go to the mikveh-- or, ritual bath-- the next morning to purify himself), the laws of forbidden mixtures, and all the laws protecting the poor, the widow and orphan, the stranger in one's land, and the hungry-- all issues on which I note that most social conservatives generally take a fairly anti-Torah stance.
And what is more, if you're going to tell me that the entire Bible is the literal word of God, and even the parables, like the Creation story, must be understood 100% literally, then I like to cite Deuteronomy 23:12-13 "You must have a place set aside outside the camp, to which you shall go out; and you shall have a spade amongst your tools, and you shall dig a hole with it, and there you shall sit, and when you sit, you shall cover over that which comes out of you." In other words, what are you doing pooping in town, you sinner?!
See, fundamentalism gets us nowhere.