A common theme that I run into fairly often talking with unbelievers, is their belief that the Old Testament is either to be taken 100% or 0%. Paul wrote in II Timothy 2:15 "Study to shew thyself approved unto God, a workman that needeth not to be ashamed, rightly dividing the word of truth."
In order to rightly divide the word of truth, one must first be able to look at the Word in it's proper context. Certainly, there are scriptures condoning the stoning of an adulteress, not taking all the eggs from a nest, etc., but what context do we need to consider these scriptures in? I am most certainly NOT condoning self-justification of ANY sin, and the "scriptures" in the OP are most certainly blasphemous.
The issue of the Old Testament is that it was written by Bronze Age Hebrews, and the Law should be divided into it's three complementary parts: Civil Law, Ritual Law, and Moral Law.
Civil Law is that part of the Law given to establish the necessary order for the Hebrews/Isrealites to build a monotheistic society based on the precepts of God's given Word. As I am not a Bronze Age Hebrew, I am not required to stone my wife to death should I catch her in the act of adultery, however satisfying I would imagine that would be in such a situation
. We have laws and statutes enacted to provide justice for many such issues/examples.
Ritual Law was that pertaining to Judaism. Pure and simple. As a Christian, I am no longer obligated to offer up blood sacrifices, wave offerings, etc. to atone for my sins. Jesus hung on a cross and shed His blood that I could be free of that burden.
Finally, we come to Moral Law.
These are things that define morality and who we should be as people, formed in the image of God. The Ten Commandments make up the foundation of the Moral Law. Also we have commandments from God in the form of admonishments against certain activities, such as homosexuality, idol worship, human sacrifice, etc.
Another thing to consider is to read the New Testament scriptures and compare them to the Old Testament, and a lot of what is written in the Old Testament (under the Law) is still applicable to us today as Christians. Only the Ritual Law can be discounted. Even at that, the Ritual Law still shows us an insight to how the spiritual realm functions.
The priests had to cleanse and check themselves before entering into certain areas of the temple proper. Even us, as Christians must cleanse ourselves from all unrighteousness. 1 John 1:9 says that "...If we confess our sins, he is faithful and just to forgive us our sins, and to cleanse us from all unrighteousness."
Jesus also represented the sacrificial lamb, in that He was pure and "no guile was found in his mouth". The priests had to check the sacrifices for defects, sickness, discoloration, etc. before offering them to God, at the risk of their own lives.
Hopefully I made a point in there somewhere, and didn't just ramble on aimlessly... But to reiterate, there is absolutely zero justification for what these people have tried to do to God's Word.
Just one more scripture, and I'll get off my soapbox...
II Timothy 2:19 KJV
Nevertheless the foundation of God standeth sure, having this seal, The Lord knoweth them that are his. And, Let every one that nameth the name of Christ depart from inquity.