I do like it that Himmel's image runs parallel with Christianity where we have images of Jesus Christ being Caucasian but in truth, we have no real images of him to begin with to base his Arabic origins. Welp, that's the renaissance for ya I guess.
Jokes aside, I think people prefer to have a religious image rather than have a hard time imagining it themselves. Word of mouth tend to change farther along the chain anyway but something has to stay consistent to make it unique as well.