Years ago, my parents got "The Message" on video. It's an entertaining (though not convincing) portrayal of the beginnings of Islam. Even Muslims have to agree that it wasn't historically perfect, since it almost left out the main character. (Occasionally Mohammed is in the scene, but always off screen and silent. Tradition prefers that no actor play the role. Once you get used to that, it doesn't spoil the movie)
Anyway, I've certainly watched worse.
Anthony Quinn played a role, I forget who.
However, I'll add my vote to "Life of Brian".