I believe in a very strict Biblical view of the origin of sin, and how it applies to all born in the flesh for this present world.
1 John 3:8
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.
KJV
Heb 2:14-15
14 Forasmuch then as the children are partakers of flesh and blood, He also Himself likewise took part of the same; that through death He might destroy him that had the power of death, that is, the devil;
15 And deliver them who through fear of death were all their lifetime subject to bondage.
KJV
Apostle John in the above was not pointing to the sin of Adam and Eve as the origin of sin. He was pointing to the devil himself, but when? Obviously, the devil sinning from the beginning had to have been sometime prior to Adam and Eve, as the devil was already in his role as adversary against God when he tempted Adam and Eve to sin. That means Biblically, we need to move back in time before Adam and Eve in order to Biblically understand the origin of sin.
In Ezekiel 28, God was giving a parable using the prince of Tyrus and king of Tyrus. There God pointed directly to Satan himself using that prince and king as 'types'. God said He originally made Satan 'perfect in his ways'. Per that parable Satan even originally served God right at His Altar, and then iniquity was found in him because Satan tried to set himself up as God, coveting God's throne, which it was his job to guard as a covering cherub.
That was when, and how, sin first entered in, not with Adam and Eve, but by Satan coveting God's throne, wanting to be worshiped as God. The very first sin in the flesh was by Adam and Eve in God's Garden, but the very first sin, the original sin, was by Satan coveting God's throne in the old world, the world prior to Adam and Eve.
We don't hear this idea being preached very often in today's Church, but it is very important to understand. The reason is because at the end of this world, God is going to allow Satan to do the same kind of rebellion he did in coveting God's throne that he did in that old world. That is what Lord Jesus and His Apostles warnings about the coming Antichrist/false Messiah are about for the end of this world, and we are almost in it today with his appearing here on earth in plain sight, working great signs and wonders, and raining fire down from heaven to the earth in the sight of men.