There are many historical figures one can make documentary of. Remember the movie Kingdom of Heaven ( I think), that shows salahudin and how merciful he was to the crusaders despite having the upper hand.
Actually this film was a political correct propaganda. It showed crusades as the bad guys and muslims only as good guys.
Anyways, I don't think you will ever show Jesus as NOT son of God in your country, so what makes you think we would show anything neglecting the Prophethood of Muhammad s.a.w. And besides, why would we even go there in the first place when it is a Muslim country where majority believe otherwise. America is not a christian country, it is a secular country that separates state and church.
Its about England , not America. Yes it is secular country but was built on christian culture, just check the english churches or other remains.
You're right. Jesus and Isa don't seem like the same person and most definitely are not the same. The Isa we believe in and love is the son of Maryam and prophet of God. The Jesus you believe in is son of God based on the pagan religion of Sun god worship that the religion of Paul taught you, a false religion that incorporated many pagan rituals and believes (like Dec 25 as xmas) to win converts.
The difference between Christ and muslim Isa is that Christ was a historical person, while there was no single historical refference about the muslim Isa as muslims see him.