"On the occasion of the birthday of the great Prophet (Muhammad) … and for the occasion of the passing of Christ, I say the Islamic Republic government and the Iranian people — with all powers and legal right to put the soldiers on trial — forgave those 15," Ahmadinejad said, referring to the Muslim Prophet's birthday on March 30 and the Easter season. [my bold]
Obviously, Christians take the meaning of the holiday to be the resurrection, not just the crucifiction of Christ. Muslim supercessionism is the big drum being banged here.
The only surprise here was that he didn't blame the Jews. That was to keep the message as black and white as possible.