No actually it puts much more emphasis on the life of Jesus, and us being alive in him.
The verse says we were reconciled to God by the
death of his son, so I believe that is how we were made alive in him, where we were once spiritually dead toward God. As Col. 2:13 says:
And you, being dead in your sins and the uncircumcision of your flesh, hath he quickened (made alive) together with him, having forgiven you all trespasses; Peter said his death brought us to God as well in 1 Peter 3:18:
For Christ also hath once suffered for sins, the just for the unjust, that he might bring us to God, being put to death in the flesh,
But since you insist on thinking Paul is the end all, I did say I think this idea started to develop back then
As I said above, Peter also said this and Peter also confirmed Paul's epistles as being scripture:
even as our beloved brother Paul also according to the wisdom given unto him hath written unto you; As also in all his epistles, speaking in them of these things; in which are some things hard to be understood, which they that are unlearned and unstable wrest, as they do also the other scriptures, unto their own destruction. 2 Peter 3:15b-16
I would point out as well that Paul tells us the whole church age was 'a mystery', or hidden from man until it was revealed by Christ.
Now to him that is of power to stablish you according to my gospel, and the preaching of Jesus Christ, according to the revelation of the mystery, which was kept secret since the world began, How that by revelation he made known unto me the mystery; (as I wrote afore in few words, Whereby, when ye read, ye may understand my knowledge in the mystery of Christ) Which in other ages was not made known unto the sons of men, as it is now revealed unto his holy apostles and prophets by the Spirit; That the Gentiles should be fellowheirs, and of the same body, and partakers of his promise in Christ by the gospel: Romans 16:25, Eph. 3:3-6
Do you feel there are any indicators to believe that Jesus himself believed he was a sacrifice, or do you just take Paul's personal belief as Jesus' word on the matter?
I've quoted too much scripture. Many times over, Jesus told his disciples that according to, or in fulfillment of scripture (OT) he must go to Jerusalem, be mocked and spitefully entreated, and put to death and on the third day rise again. He said that as the serpent was lifted on the bronze pole, he must be lifted up, signifying how he would die. He expounded to the two on the road to Emmaus how he had to die according to scripture. I would add that I believe the whole Bible, all 66 books are the Word of God.