As for the study mentioned by HPS Lydia, I will just add the following. Areas of the brain damaged by this procedure are usually associated with reasoning, perception and emotions. And keep in mind such damages are observed in modern times when circumcision procedure is relatively "safe" and sterile. Just imagine what damage happened to newborns in the past when people had no idea what sterilization even is. And how many infants died because of this. However, this seems to be useful to certain groups of people trying to push their Yehuborim influences. If the brain is partially lobotomized, it is easier to introduce spiritually destructive patterns into their entities. I would say this procedure is the result of careful engineering against humanity through building individuals that would later preach nonsensical spiritual ideologies. I have even seen some "studies" claiming that circumcision is very useful and healthy for the male, men that went through it make women happier in their sex life. "Strangely", I have seen this nonsense among communist forums in the past.