My opinion:
Christianity is Christ. Neither Paul nor any other New Testament writer brought more to Christianity than Christ already had - which was Himself. I think this is reflected in Paul's own statement, For when one says, "I belong to Paul," and another, "I belong to Apollos," are you not merely men? Neither he who plants nor he who waters is anything, but only God who gives the growth [1 Corinthians 4,7].
The most important New Testament writings, again in my opinion, are the Gospels. The other writings (except maybe Revelation) are expositions on the Gospel teachings by the Apostles or those who passed on what they heard from the Apostles (e.g. Mark). There is actually a large corpus of writings that are also edifying written by those who were taught by the Apostles - the so-called "Apostolic Fathers" - but these writings were not included in the canon because they were not of the Apostles themselves, but by those who followed after them (e.g. Ignatius, Polycarp, Barnabas). Then there are writings of those who were taught by those who were taught by the Apostles, etc. (i.e. other Church Fathers).
I don't believe it is correct to say that Paul's writings somehow complemented or completed what was taught by Christ. I think, rather, that he and the other New Testament writers provide interpretation of the Gospel teachings and not new revealed truths that were somehow "missed" in the Gospels.
My opinion, anyway.
"The Resurrection is the central theme in every Christian sermon reports in the Acts. The Resurrection, and its consequences were the "gospel" or good news which the Christian brought: what we call the 'gospels,' the narratives of Our Lord's llife and death, were composed later for the benefit of those who had alrady accepted the gospel. They were in no sense the basis of Christianity: they were written for those already converted. The miracles of the Resurrection, and the theology of that miracle, comes first: the biography comes later as a comment on it. Nothing could be more unhistorical than to pick out selected sayings of Christ from the gospels and to regard those as the datum and the rest of the New Testament as a construction upon it. The first fact in the history of Christendom is a number of people who say they have seen the Resurrection." (C.S. Lewis, Miracles. pgs. 143,144).
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