Firstly - you missed the concepts of "HUMANITY". and "OPEN-MINDEDNESS". These rulers also were blined by the religions of power and money!
Secondly, millions of people and hundreds of civilizations - Persians, North Africans, Aztecs, Mayas and countless others, have been obliterated in the name of religion. Forgotten the "Crusades"? What about the "Inquisition"? "Jihad" has been going on since Islam started! Millions of women in medieval Europe were killed as they were suspected to be "witches". Hindus themselves spread a reign of terror against the Buddhists during the 2nd-3rd century A.D. and managed to drive Buddhism out of the country! All this happened due to a false sense of religious superiority and blind belief in religion. In the 20th century, all that changed was that political ideology, money and power became the new religions. The key factor being "NARROW-MINDEDNESS, INTOLERANCE, and BLIND_FAITH".
