Sin did enter the physical existance through Adam , Sinful spiritual beings were already here.
Romans is showing the comparioson of effectiveness of Jesus and Adam . Are all men saved through Jesus? Did Jesus establish a method where we could be saved? Through Adam a way of sin was establisjhed or cursed. Are we required to participate? Are we required to participate in salvation?
This place is a prison occudied bt those who cannot see. God chose a method where we can participate in salvation, to be human is the first prerequisite.
This was his mission statement
Luk 4:18
The Spirit of the Lord
is upon me, because he hath anointed me to preach the gospel to the poor; he hath sent me to heal the brokenhearted, to preach deliverance to the captives, and recovering of sight to the blind, to set at liberty them that are bruised,
We think we are not captives, We think we are speciial but we are the condemned
Jhn 9:41¶
Jesus said unto them, If ye were blind, ye should have no sin: but now ye say, We see; therefore your sin remaineth.