Neither are there of Alexander the Great, but never in your life have you ever questioned his historicity. The accounts we have of Alexander the Great were written four centuries after he died.
The question is about what does the evidence point too. The evidence points to the fact that the gospels were authored by eyewitnesses, or by people who interviewed the eyewitnesses.
I'm satisfied that previously in this thread you conceded that there is sufficient evidence to accept these are probably historical facts:
A Jewish rabbi named Jesus of Nazareth lived in first century Galilee.
He had a ministry and disciples.
He was arrested by the Sanhedrin, and executed by the Romans.
His students genuinely believed they saw him after the crucifixion.