I have family who know how to read Arabic, 

I have friends from Muslim countries/faith.

It's not a secret.

Jihad = Spread Islam & it's in the Quran.

How people end up spreading it, that's where the Muslims diverge - from classically peaceful ones to the death cultists who are barbarians.

They even diverge between themselves & these are the deadliest conflicts in the world: 

Sunni vs Shiite.

Yemen & Syria civil wars - millions dead.