This is something that used to be taught in schools and still should be taught, but you know that it isn’t. It is why we much older folks clearly understand the danger and poison of Islam while the brainwashed younger folks are oblivious to it. They don’t teach anything negative about Islam anymore, which means there isn’t much to teach about it except forcing kids to learn the Koran.
By the 80s when I was in high school the lie thatIslam preserved knowledge was already everywhere. It spread out from Pro-Islamic university departments and Muslim Brotherhood allied organizations alike and had been pushed for years before then in various circles.
With one word, “Islamophobia”, Muslims have been able to graft their advances on top of the left till at last with the arrival of Obama the DNC proper has basically become an organization split between cultural Marxist sheep and Islamist toadies.