Well, I am not really a Christian, but I like to occasionally quote the Bible since the King James Version has such poetic parts to it. I can't answer your question Heywood, except with another -- Where did you get the idea that Christians had to be logical? I've never thought of it as a logical religion, but one that is based on revealed truth which is received on faith. Lots of shifting sands there.
I certainly agree that you are exactly right -- it is totally ridiculous to use one part of Leviticus to prove some pet point and then ignore all the rest of its pronouncements.
I looked in Timber's excellent link at my favorite book (Ecclesiastes) and was gratified, I admit, to see that it was called "By far, the best book in the whole Bible." Wonderful when I read something that agrees with my own feelings.
That's true faith at work.