Push comes to shove, Muhammad had persuaded an army of men that were also in the wasteland to see him as a prophet of the god of Abraham. Unsuprisingly as the god of Abraham teaches to wage war and kill all the inhabitants that do not convert to him, Muhammad with his ogres decided to wage war with various Arab cities and to FORCE conversion and kill anyone that did not believe in him. This is what the god of Abraham commanded Muhammad to do in the dreams and visions he had. Muhammad built incredible military might gor himself, as he successfully invaded, destroyed, and converted many heathens into the Abrahamic family - specifically to the sister that is known as Islam today.
Muhammad taught that HE was the most important prophet and the last prophet before the end of times when Allah would create a new Earth for HIS PEOPLE - the Semites. All other peoples who are not Arabs will be servants to the Arabs in paradise and on the New Earth. But if non-Semites wish to avoid hell and the eternal fire, than non-Semites must profess Muhammad as the prophet of Allah and accept it - and do what it says. If they do this, they will be rewarded as the servants of the Semites and they will be happy to be servants of the Semites because... the Semites are God's chosen! They are awesome, who wouldn't want to be servants to God's people unless they are possessed by the Evil One? The alternative is hell, so you choose.
After Muhammad died in Medina from illness, many Arabs outside the levant now became Islam's flying monkeys. The youngest sister of the Abrahamic family was now born. As it is a war of narcissism and chaos that must gain as many flying monkeys as possible like Christianity, From there the Muslims went to conquer the world. Muslims left a trail of destruction and killing anywhere they went in all four directions, as instructed by the god of Abraham / Allah. Arabic gained status of Holy Language as this was the language Muhammad spoke and his words were recorded in. So many people were forced to learn the Semitic language Arabic as they were forcefully converted to Islam, or else - 🔪🩸. They were also to recite in Arabic, develop Muslim ways of life and teaching. No other religions, customs, were allowed - except the ways of Allah - chaos and narcissism.