Because Judaism and Islam are Middle Eastern religions and the dynamics of the culture of those two faiths reside in the regions to where they began.
I don't see how that's a reason.
With that being said, it is important to depict characters central to those faiths in the most accurate fashion.
Why?
Christian Bale if I'm not mistaken is Australian, Moses was not Australian nor was he of Anglo-Saxon heritage.
So?
I'm sure Julius Ceasar didn't speak english either.
This matters because if you're going to tell the story of a central figure it has to be accurate, not relatable to the ethnic culture of the dominant ethnic group. In addition to that, even if we depict characters accurately we may not know if they truly do look like the very actor to whom the prophet is being portrayed by.
Yes, I know what you are asserting by now. I'm asking you why I, or people into the creative arts, should care about your opinion...
It matters for the same reason why we tell anyone a story, because we want to get the most accurate message across. when I die and someone did a movie about me, is it necessary that some guy from South-East Asia depicts me in the story? No it is not necessary and in fact it is not an accurate depiction of me. The thing is we need people to tell the correct story, not white wash to fit a narrative for the majority.
Again.. why is that "needed"?
Don't you think people realise that if they watch for example the series "Rome", that they didn't actually time travel to ancient Rome to film scenes there and that as a result of it, it will not be a 100% accurate depiction of it, no matter with how much care they try to do it?
Consider Monty Python's "The Life Of Bryan". This thing is so classic...
Imagine doing a film like that in context of Islam.
Last time someone made fun of islam only using a drawing, embassies were burned and people got killed.
I think it's kind of obivous that the reason for the lack of islamic flicks of that nature compared to flicks of
any other religion, is to looked for in that area and not this nonsense about "respect" and concern of accurate depictions.
Because let's also be honest here... It wouldn't matter one bit how accurate or inaccurate such a flick would be. You know in advance that it will cause turmoil.