I disagree. It is easy to hire actors with no talent to read a script and act in front of a green screen (which is what they appear to have used). The Brotherhood, if setting up a provocation, would be likely to prefer actors who would be particularly provocative. After you have the film, you can edit it together to tell a different story from the one the actors think they were telling. Even using the name "Mohammed" would not be much of a clue because it's such a common name.
Nor do the other cast members, by and large. This was a southern California production, made by Nakoula Basseley Nakoula, an Egyptian Copt with a checkered past, who passed himself off as Sam Bacile, an Israeli Jew. It's all coming out ... more here.