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: - Rom. 5:12
Sin and death "entered the world" by the act of one man - Adam. When God had finished his creation on the sixth day, there was no sin, death and Satan in that world or else he could not say everything was "very good" (Gen. 1:31). Lucifer the unfallen angel existed on that day. Man in the image of God existed on that day.
And God said, Let there be light: and there was light. And God saw the light, that
it was good: and God divided the light from the darkness. And God called the light Day, and the darkness he called Night. And the evening and the morning were the first day. Gen 1:3-5
At that moment was it already foreordained, Christ as of a lamb without blemish and without spot: Would shed his precious blood for redemption? --------------------Why?
At that moment how was Christ the Son of the living God going to be manifested in order to shed blood for redemption?
What is the primary purpose for the Son of God being manifested?
1 John 3:8 He that committeth sin is of the devil; for the devil sinneth from the beginning. For
this purpose the Son of God was manifested, that he might
destroy the works of the devil.
Will redemption destroy the works of the devil?
But with the precious blood of Christ, as of a lamb
without blemish and without spot:
Behold,
a virgin shall be with child, and
shall bring forth a son, and they shall call his name Emmanuel, which being interpreted is, God with us. Then Joseph being raised from sleep did as the angel of the Lord had bidden him, and took unto him his wife: And
knew her not till she had brought forth her firstborn son: and he called his name JESUS.
Behold, I was shapen in iniquity; and in sin did my mother conceive me.