1. good, so since we understand the word of God never ordained such actions than we must conclude that christianity had nothing to do with those actions.
2. its like the pot complaining to the potter that he uses it for trash instead of a flower pot. you or my opinion of God's sovereign choice couldnt be more irrelevent. God the creater can do as he pleases with what he has created. keep in mind that he could've just destroyed us, wiped every one of us out but he chose to seek after us in order to restore the relationship he had at first. he loved us even when we turned our backs on him and said he doesnt exist. if you cant except God's authority and sovereignty over his own creation thats a "you" problem.
3. God dying on the cross for our sins allowed us to have full access to God through christ. we all now have access to the holy of holies that only certain priests had during the old covanent. the relationship that God had with adam before the fall has now been restored as all sin was put on christ on the cross. believers in christ can now have intimate relationship with God the Father.
does it eliminate man desire to sin? no. people still choose sin anyway, but some do not and follow christ. for those who do not they now have full access to God through christ.
4. we would have to look at why God chose to institute a covenant where the blood of certain animals was used on the holy alter for atonement for sin.
in secular society if you commit a crime there is punishment for it. there are consequences for wrong actions. you go to jail, you get grounded, you lose certain privilages, you pay fines. you dont just get off scott free like nothing happened. you must pay your debt to society.
in the same way man had sinned before God and had to pay their debt to God so God in establishing a covenant with the israelites coming out of egypt he ordained blood sacrifices for sin atonement. this is the way GoD decreed that man would pay their debt to him for their sins.
God grew tired of this as he saw that man's hearts were corrupt. they followed all the rules and regulations but their hearts were far from God.
what these people were trying to wrongfully establish was what some like to call "fire insurance". they dont give a crap about God in reality but they'll follow the rules so theyi can be on God's good side. God detested this condition of their hearts and expressed as much in isaiah chapter 1.
so jesus comes into the picture. now understand that the new covenant in christ doesnt erase the old covenant of moses(matthew 5:17-20), it just makes it obsolete. its still there, but we dont have to live by it because of the new covanent of grace.
Acts 13:38-39; hebrews 9:11-28; hebrews 10:1-18
God ordained that Jesus would be sacrificed on the cross keeping with the law of moses which required blood sacrifices for the atonement of sins. Jesuss sacrifice was the complete and final atonement for all of man's sin giving us the access to God that adam had in the garden of eden before the fall of man.
this is why Jesus was sacrificed.
The wrath of God is being revealed from heaven against all the godlessness and wickedness of men who suppress the truth by their wickedness, since what may be known about God is plain to them, because God has made it plain to them. For since the creation of the world God’s invisible qualities—his eternal power and divine nature—have been clearly seen, being understood from what has been made, so that men are without excuse. (Romans 1:18-20)