History involved many genetic replacements. When countries find ancient bones buried in their lands, it’s usually the case that the people who live there now are not related to those ancient people.
If we take the literal purported lives of certain historical religious figures like Muhammad as a way to live our own lives, then that leads to immoral and barbarous behavior. It is better to see them as inspirations in some spiritual or mystical way.
Indo-European genes and language stretch from Western Europe to Sri Lanka. They were an early horse-people, that used their nomadic technologies like horse-riding, wagons, and chariots to dominate far in different directions. Genetically, their male lines spread far by dominate men having children with many women.
Islamic sacred writings were written hundreds of years after the life of Muhammad, and Muhammad claimed to have received revelations from God that conveniently allowed him to do things that were politically expedient for him, and would change as his political needs changed.
“Islam is a militaristic political system that preaches the subjugation of all of humanity and their submission to Allah who created all humans just so they worship him”