I do find this concentration on St Paul both bizarre and humorous; after all, he arrived on the scene several years after the original disciples, who taught much the same as he did - and probably kick-started his understanding if only via the teaching of people whohad heard the disciples teach and preach. If you notice, neither Paul nor the disciples associate the crucifixion with human sacrifice; it was associated with the regular sacrifice of animals that 'worked' for sins committed, but not for sins 'to be committed' - hence their having to be repeated regularly. His once for all time sacrifice superceded the annual sacrifices that the Jews (and other religious beliefs) held to be vital.
I suppose it's nice to find a few things in life which are amusing, but I'm surprised to find you so blithely dismissing the misgivings which many scholars have had about Paul - ever since they started looking at the Bible at all objectively. As for the other disciples "kick-starting" his understanding: you've obviously forgotten what Paul wrote in Galations 1 & 2.
"15] But when he who had set me apart before I was born, and had called me through his grace,
[16] was pleased to reveal his Son to me, in order that I might preach him among the Gentiles, I did not confer with flesh and blood,
[17] nor did I go up to Jerusalem to those who were apostles before me, but I went away into Arabia; and again I returned to Damascus.
[18]
Then after three years I went up to Jerusalem to visit Cephas, and remained with him fifteen days.
[19]
But I saw none of the other apostles except James the Lord's brother.[20] (In what I am writing to you, before God, I do not lie!)
[21] Then I went into the regions of Syria and Cili'cia.
[22] And I was still not known by sight to the churches of Christ in Judea;
[23] they only heard it said, "He who once persecuted us is now preaching the faith he once tried to destroy."
[24] And they glorified God because of me.
Gal.2
[1]Then
after fourteen years I went up again to Jerusalem with Barnabas, taking Titus along with me."
Galations 1 & 2.
You also need to contrast this with what Acts 15 says, and ask yourself if both can be true.
As Prof Barrie Wilson explains here:
Taking Paul at his Word, Prof.Barrie A. Wilson
www.barriewilson.com/pdf/Taking-Paul-at-His-Word.pdfA salient quote from the above is the following:
"Paul emphasizes, time and time again, that he did not receive his message from any
human being (Galatians 1:1 and 1:12). Nor was he taught it (Galatians 1:12), for
example, by earlier members of the Jesus Move
ment. Rather he contends that his source
of information was experiential, that is, direct contact with the mystical Christ. In
particular, he stresses that he did not re
ceive instruction or validation from the
Jerusalem leadership. He explicitly affirms that after his remarkable experience, he did
not go up to Jerusalem to confer with James, Peter and others who were there (Galatians
1:16). In other words, he is denying the linkage between his movement and the Jesus Movement"