What’s funny is that the Christian Virgin Mary wears a veil in every idolized depiction of her, but nobody says anything about that...

This is absurd. It’s to show one’s humility before God, and identical to the Jewish Kippah, which many, many men wear. There are also traditional hats for Muslim men that serve the same purpose, like the Taqiyah, or a Kufi for that matter, depending on where one is from. These semitic religions have common themes…

To underscore your point; a traditional religious education negatively correlates with extremism. That’s why many people recruited by extremist groups weren’t religious before. Their ideal recruit is someone with only a minimal formal religious education but with a strong sense of grievance.