Why can't Christians say that parts of the Old Testament don't apply??..

[solja247]

I also ask, "Well, if these laws don't apply any more, then why are they still in the book?" (After all, when we repeal laws they are removed from the law books!)

They are in the Bible because they are part of the Torah and as Col 2:16 says are a typology of the first coming of Jesus.
I am seeing the Mosaic law more for this reason:

The verses which bracket chapters 11-20 (see note 6) use the key verb "to divide, distinguish, or separate" (V*iI3ü) in 10:10,11:47, and four times in 20:24-26: the priests are called to teach Israel to "make distinctions," because God has "distinguished" Israel from the nations. This key verb echoes Genesis 1, where God's own creative work partly consists of acts of separation or distinguishing (Gen 1:4,6-7, [9], 14,18), and where all the varied forms of life reproduce "according to their kinds." Purity calls human beings to imitate God, who draws lines of separation so that life can flourish. For this theme, Lev 19:19 serves as a hallmark: Israel is forbidden to cross-breed animals, to sow a field with two kinds of seed, or to wear clothing of mixed fabrics. In line with this theme, Lev 18:23 brands bestial sex as b'Dfy, (NRSV "perversion"), which properly means "mixture." In this thinking, God has established order to carve out a place for created life to thrive; when creatures violate that order, the chaos of Gen 1:2 is invited back in, just as the great flood came gushing in after such major boundary-crossings as in Gen 6:1-4.

@Godschild-why were those regulations there to begin with? I mean, seriously, why did people have to be stoned to death just for violating the Sabbath. I don't expect you do have all the answers, I don't.

To set them apart...

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Absolutely. The time to tolerate mythic ( and epic ) foolishness is past.

Thiests and Atheists who rip each other off are like two blind men who rip each other off for being blind, yet, they themselves are still blind...