While Jesus was alive? Did he ever hear him preach? Dis he spend any time with him other than this minute long conversation in a 'vision'?
You are showing the most extreme example of ignorance, I have ever seen displayed. Do you know nothing about the early church? Do you not have an understanding of who wrote the Scriptures, and why?
Paul is credited with writing more words in the Bible, than any other writer. His letters were written to the early Christians, spread through the new world, to correct matters of dispute, and heresy. He is not only the most prolific, he is considered the foremost AUTHORITY, on Jesus.
Maybe you ought to start with Matthew, and read through Revelations, then get back to me...
You are assuming that Christ did not come back after the crucifixion in the flesh. Once you go there, you have pretty much abandoned Christianity. Peter, the designated leader of the Apostles, accepted Paul as one of the twelve and stated that Paul's writings were scripture.