On the "ransom" thing, it is only JWs who fixate on the Adam-Jesus equivalence. Russell taught that Jesus only died for Adam who was always destined to sin. Rutherford changed that to something like the value of the perfect life that Adam possessed. Typical lawyer.
Most christians believe that Jesus died as a vicarious sacrifice for the sins of believers - or all sins depending on theological flavour.
Surely he took up our pain and bore our suffering, yet we considered him punished by God, stricken by him, and afflicted.
But he was pierced for our transgressions, he was crushed for our iniquities; the punishment that brought us peace was on him, and by his wounds we are healed.
We all, like sheep, have gone astray, each of us has turned to our own way; and the Lord has laid on him the iniquity of us all. - Isa.53
He made the One who did not know sin to be sin for us, so that we might become the righteousness of God in Him - 2Cor.5
So most christians have no problem dropping Adam and keeping Jesus.
Here endeth today's sermon - go in peace.