It doesn't really matter how "real" you perceive Mohammad to be. MY belief is that Jesus is very real and IS the son of God. That is MY faith though, and I have no right to force that upon someone, or the right to force someone to say: Jesus WAS real historically speaking. That would not be civillized. It would also go against my faith to do that. You cannot be forced to God. Then it isn't your belief. But I am diverging off the main point.
The main point is that Iran is only murdering this man because of his religous difference. It is barbaric and uncivillized. No civillized government would allow a man to be put to death for his religous difference. That is ANYWHERE on Earth. When will Iran learn tollerance?