It does not have to be very complicated.
When we witness to people it is the Gospel we tell them not some deep theology because it is the Holy Spirit that ultimately saves people.
And people are saved by basically looking up at the serpent that was lifted high, not understanding the properties of copper or bronze and it's carbon makeup and how atoms are formed and why they stick together.
Grace brings us to Christ, lifted high, then Grace enables us to believe, bam, Salvation.
The only disobedience that I know of with regards to God is transgressing Him.
He tells us not to do something and we go ahead do the very thing we are told not to do.
Take Adam, yes, in fact take Adam, the main cause of the human species problem. Understand Adam and you can grasp our predicament.
People can write books on this but it is very simple. Adam had a choice, we in Adam do not.
We cannot but sin. No excuse, we are vermin in our characters because of Adam.
I am totally clear about what I believe.
We are sinners, born as such and totally dependent on Grace.
None of what you seek is of importance I think.