Wa alaykoum a salam
Eid mubarak, I just find the Gospel of Barnabas close to the teaching of Jesus peace be upon him, the writings attributed to Barnabas have been the source of dispute among biblical scholars. The early Christian writer Tertullian assigned to him the authorship of the Epistle to the Hebrews, in accordance with second century church tradition. The apocryphal Acts of Barnabas, a work of late date, recounted his missionary tours and his death by martyrdom in Cyprus. The existing Epistle of Barnabas, found in a New Testament manuscript (part of the Codex Sinaiticus), is morally instructive work.
You will find that some Christian Scholars claim that this Gospel has Arabic comments and was written originally in Arabic. Some even claim that it has an Islamic origin, or was used by Muhammad in writing the Quran. All historical accounts establish that Muhammad was unlettered; that is to say that he could not read or write. After Islam, there were debates between Muslims and Christians and no Muslim ever referred to that Gospel. Therefore, this Gospel was not known in Islamic history. Unless some scholars claim that Islamic history was corrupted and the usage of this Gospel was concealed! Anyone who studies Islamic history will immediately know that this is one of the many stereotype claims against Islam.
The interesting part is that if you look into the Gospel of Barnabas you will find out that it differs from the Biblical Gospels in the following basics of the Christian religion:
Jesus is not the Son of God. He was a great prophet.
The sacrifice that Abraham offered to God was Ismael and not Isaac.
The Gospel made clear prophecy about the coming of Muhammad.
Jesus was not crucified. The one that was crucified in Jesus place was Judas by another miracle of God.
Salaam and Eid Mubarak to you too!
Oh I agree that there are many similarities between the Gospel of Barnabas and Islamic teachings about Isa (pbuh). But if it was indeed a late work as the evidence suggests, later, certainly, than the Holy Qur'an, and likely much later, then it's not a reliable original source for the teachings of Isa (pbuh) and what happened to him. I personally prefer to stick to the Holy Qur'an and the authentic Ahadith in this matter.
Ws