In defense of Paul, he suffered greatly and was imprisoned and ultimately killed. I don't know of anyone who would willingly put their life on the line in order to preach the gospel if they were actually lying about it. Before he was converted he had a high position. So it doesn't make sense that he would just give up his authority and join a cause that he knew he could be killed for. He witnessed Stephen being killed. And furthermore, it isn't very likely that the word of God that is accepted worldwide is written by someone that God allowed to deceive people. If God has protected the holy scriptures throughout the ages, it's a safe bet that it is one hundred percent correct and that no human has been able to corrupt it, although many have tried to corrupt it through different translations, the true word still exists. The dead sea scrolls may have some of the scriptures intact, but that doesn't necessarily mean that they all are inspired by God. There are many books that were excluded from the bible, but those that were written by Paul were included. I believe that God, being all powerful over the entire universe, could very well make sure that His Holy Bible was and is without fault.