Muslims needs to read this about the early church leaders in the second century, part four

Irenaeus. He was Bishop of Lyon in AD 170. His works are highly esteemed, for he was the disciple of Polycarp, the disciple of John the Apostle. He also knew many who had known the disciples of Christ. Although his writings were numerous, only five have survived. In these, he refutes the falsehoods of deceivers, manifests a remarkable knowledge of pagan writings and misleading heresies and demonstrates his mastery of both the Old and New Testaments. He quotes from all the books of the New Testament, except the letter of the Apostle Paul to Philemon, 3 John and James, because they were unnecessary for his argument. His references are lengthy and they show that the books we have today are the same which were in circulation during his day.

http://www.answering-islam.org/Quran/index.html