--->Jews that use their mouth during circumcision<---
OK. Right off the bat, that doesn't seem very hygienic. So, without the need to watch the Video, I'd think that was a Bad Idea.
But, you have to realize, these Religious Cults have a lot of strange traditions and rituals.
I think there is one group that practices a form of cannibalism ... 'eating and drinking the blood and flesh' of their Prophet.