Because despite the fact that those people seek intercession from Imams, mutilate their bodies etc they did not change a single word in the Qur'an...

All differences in Islam are external to the contents of the Qur'an..

Religion is creation of men.

First, it was the Egyptian embassy, second the American embassy, later Denmark, then the British embassy was ransacked by mostly Basijis, and now, it is the turn of Saudi Arabia's embassy to be attacked by crowds of Iranians. What kind of diplomacy is Rowhani's government referring to?

These kinds of assaults on foreign embassies and diplomats have several dimensions; they appear to be a systematic reaction as they follow strong remarks from Iran's Supreme Leader. Iranian media outlets normally refer to these attackers as passionate young people or "followers of the Imam's route," rather than aggressors.

In addition, it is intriguing that Iranian forces which are very quick at identifying demonstrations, are always late to act when it comes to these types of pre-organized and sophisticated attacks on embassies. Moreover, the perpetrators of these attacks generally attempt to show their loyalty to the ideals of the Supreme Leader and the Islamic Republic's revolutionary principles. As a member of Iran's semi-militia group, the Basiji, pointed out: "We will stand by the Supreme Leader against any country which he views as the enemy."