Killing animals to clothe Adam and Eve was not an atonement. The clothing did not amend anything.
What did the Passover amend or atone?
This is exactly why your theology is so flawed. You have failed to understand the BASICS of Bible theology. When you do that and the foundation is missed......everything else is flawed.
Allow me to say to you that the moment Adam and Eve sinned, they were guility and they DIED SPIRITUALLY. At that very moment they had to have an answer for teir sin as the Bible says that :The wages if sin is death".
The Bible teaches us that because we are descendants of Adam we share in his guilt.
Romans 5:12...………
"Wherefore, as by one man sin entered into the world, and death by sin; and so death passed upon all men, for that all have sinned".
Romans 5:15...………
"But not as the offence, so also is the free gift. For if through the offence of one many be dead, much more the grace of God, and the gift by grace, which is by one man, Jesus Christ, hath abounded unto many".
As a result, we need the sinless righteousness of another, Jesus Christ, the promised seed, because our good works are not good enough to cover our debt of sin in the present or for eternity.
Romans 5:17...…..
"For if by one man's offence death reigned by one; much more they which receive abundance of grace and of the gift of righteousness shall reign in life by one, Jesus Christ.".
Philippians 3:9...…..
"And be found in him, not having mine own righteousness, which is of the law, but that which is through the faith of Christ, the righteousness which is of God by faith".
So then my dear friend, the picture in Genesis 3 of a merciful God covering the naked sinner with the garment of righteousness, and salvation through the
substitutionary sacrifice of an innocent victim really does point to Jesus Christ’s death for mankind accepted by the Just God who never allows sin to go unpunished. Jesus the Lamb of God took the punishment in our place.
John 1:29...…..
"9The next day John seeth Jesus coming unto him, and saith, Behold the Lamb of God, which taketh away the sin of the world."
Then you asked...….
.What did the Passover amend or atone?
I can hardly believe that I am having to explain this to you or anyone else for that matter.
Jewish tradition did indeed view the Passover sacrifice as being expiatory; that is, the lamb removed sin from God’s view. The Passover lamb died under God’s outpoured wrath, thus covering over the sins of the one offering it. Here’s what Rashi, a well-respected medieval Jewish commentator, has to say:...……….
“I see the Paschal blood and propitiate you. . . . I mercifully take pity on you by means of the Paschal blood and the blood of circumcision, and I propitiate your souls” (Ex. R. 15, 35b, 35a).
During the tenth and final plague in Egypt, the Passover sacrifice literally saved individuals from death as seen in Ex. 12:23. On the basis of the redemptive offering of the Passover blood, the firstborn lived.
Again, Rashi comments:...……
“It is as if a king said to his sons: ‘Know you that I judge persons on capital charges and condemn them. Give me therefore a present, so that in case you are brought before my judgment seat I may set aside the indictments against you.’ So God said to Israel: ‘I am now concerned with death penalties, but I will tell you how I will have pity on you and for the sake of the Passover blood and the circumcision blood
I will atone for you’” (Ex. R. 15.12, on Ex. 12:10.