MisterE, I submit that you are reading too much into the idea and commission of sin. Paul says that humans are without any excuse before their Creator-Judge when they have turned their backs on him in the face of his revelation of his great creative power shown in his amazing universe:
Rom 1:18 For the wrath of God is revealed from heaven against all ungodliness and unrighteousness of men, who by their unrighteousness suppress the truth.
Rom 1:19 For what can be known about God is plain to them, because God has shown it to them.
Rom 1:20 For his invisible attributes, namely, his eternal power and divine nature, have been clearly perceived, ever since the creation of the world, in the things that have been made. So they are without excuse.
Even ignoring the Creator's "eternal power and divine nature" qualifies as sin, according to Paul. Thus, we're all guilty until faith in Jesus' atoning sacrifice takes away our guilt. That's Paul's point in Romans 1:18--3:21.