[Campion]

The Gospel of Barnabas was accepted as a Canonical Gospel in the Churches of Alexandria till 325 CE Iranaeus (130-200) wrote in support of pure monotheism and opposed Paul for injecting into Christianity doctrines of the pagan Roman religion and Platonic philosophy. He quoted extensively from the Gospel of Barnabas in support of his views. This indicates that the Gospel of Barnabas was in circulation in the first and second centuries of Christianity.

In 325 (CE), a council of Christian leaders met at Nicaea and made Paul's beliefs officially part of Christian doctrine.

This is of course almost totally fictional. The "Gospel of Barnabas" they're talking about is almost certainly a medieval Islamic forgery written to discredit Christianity. No manuscripts of it older than the early 15th C. have ever been found.

Nicaea never "made Paul's beliefs officially part of Christian doctrine," because they had always been part of Christian doctrine from the earliest days.

[xzins]

I’m wondering if they meant to say the epistle of Barnabas, but I have no way of checking on them or their sources.