Whitewashing Christian persecution will not work. It is a well known fact that paganism was persecuted and thousands of "witches" burned. Yes, there is no Arian, Albigensian, church etc... There are neither pagans as well due to Roman persecution and then medieval groups that persecuted them. However ther were still Christian and Jewish groups in the Muslim world albeit second-class citizens. Compare Muslim and Christian treatment of Jews in the medieval period. What did Christians do in the Americas? How were the black slaves converted?
Europe is very nominally religious, fortunately. Science has done more for humanity. The internet is one example. What have the Pope, the Ayatollahs,
Evangelicals, and Brahmins done? They have done little to nothing.