The Qur’an repeats the mythology in vogue at the time of Mohammed. His thoughts reflect ancient teachings about the earth, the sun and the creation. These teachings can be traced in the well-known mythology of the people of the middle and Far East.
This is taken from Dr. Amari's book, Islam in light of History
Gospel of Barnabas
The Gospel of Barnabas is widely considered a pseudepigraphal work, likely written no earlier than the late medieval period. It should not be confused with the Epistle of Barnabas or other ancient Christian texts whose origins and manuscripts are well established.