The followers got lost by the works of paul. Most of the bible NT belongs to paul. The four gospels are equal to one book only because they are the same subject. These four gospels were written much after 80 A.D. They do not even mention paul even though paul had been executed in 64 A.D. Paul was the first one who came in the name of Jesus and preached his own philosophy.
This is a much unlearned understanding of Christianity.
Except for the fact that Paul said very unfavourable thing about false prophets, the reason why he was rejected by the Muslims, not Mohammad, there is nothing in your argument so far that prove Paul is not the disciple or not giving the right teaching of the apostles.
Paul is not mentioned in the Gospels because the Gospels are the story about Jesus and Paul was not in the scene yet. If Paul died in 64 A.D. how could he be mentioned in the Gospel when Jesus died about 33 A.D. ? He was not in the scene during Jesus’ time and Paul made that very clear himself.
Christians do not have problem with the four Gospels. They were report about Jesus by four different reporters about things that were relevant for our belief. Each reporter (Gospel writer) reported according to the audience that they were addressing.
For the Christians, in fact the four Gospels are more than enough. If we can follow everything that they contain perfectly, you would have perfect Christians everywhere, unlike what we have now. Believers are always struggling to follow the way of God because they are just humans.
The gospel writers should have mentioned the conversion of paul. It could have been a miracle of Jesus. Because they did not mention paul, his credibility goes down. Muslims do not know paul and his teachings are notin line with those of Jesus.
Luke, a Gospel writer, mentioned about the conversion of Paul.
Muslims not only do not know Paul, but they also do not know Mathew, Peter, James and John, Philip, Thomas, Bartholomew, Simon, etc. These were intimate disciples of Jesus whom he had elevated to the rank of apostles. They were first confidants to his thought, and his deeds were understood by them. Christianity is based on the teachings of the apostles because they were firsthand witnesses of Jesus.
The system of Jewish master-disciple relationship in Jesus time is very important factor for us to really appreciate the knowledge that the apostles had about Jesus. It is not just about verbal teachings but Jesus action as well, must be understood in the context of when and what happened.
Muslims are therefore lacking in knowledge about Jesus because they do not have good source on where to get good information about him.