I can understand the protests (though I think protesting goes a little far). The problem with this film, as Christians see it, is something like what's wrong with the "Batman v. Superman" movie: it gets the motivations of the main characters wrong and eliminates the elements that made them worth rooting for in the first place. I seem to recall that, at the beginning of the film, Jesus was willing to let his followers die for his own personal glory, and that's about as "off" as having Superman destroy Metropolis.
Later in the film -- where the actual "temptation" occurs -- we get to the part that the Religious Right really got mad about, that Jesus might have a sex drive. Because OF COURSE that's the worst possible thing to them.