The point may be that the personification of some religions/ideologies can reasonably be considered as morally a significantly better person than "average", lik

The point may be that the personification of some religions/ideologies can reasonably be considered as morally a significantly better person than "average", like Jesus or Buddha, whereas other religions/ideologies, like Islam, have a morally reprehensible personification. The point seems to be that in neither case does the "average" follower become any better or worse, but the extremists of those religions are significantly different. In every case the extremists become closer to the idealized figures from the ideology, so Christians are prone to self sacrifice, Buddhists are prone to an ascetic, isolated life, and Muslims are prone to violence if this happens. Not sure about how it causes mono-culture. It seems to me at the beginning of the 20th century, every region on earth was a mono-culture, no matter it's ideology.