Bai Saggabai, I don't support the theory of God creating only Adam and Eve and neither do Muslims so we are not burdened by the idea of lots of sexing up between Adam, Eve and Cain with producing everyone in the world today through powerful ejaculations as you refer to it.
Secondly, there is no need for any Mahdi from Iran or anywhere else.
Suh why you asked the question about where the other people came from.
The time of the muslims were about 1500 years ago. They are not new to knowledge. Before the umbrella of muslim, they were from the babylonians, syrians, assyrians, medes, persians and all ah dem other ......ites. Those societies have lots of documented espisodes of the existense of life. Many of what is written on clay tablets are recorded in the bible. Which is the first, I doan know. But I know God is supreme, He was the beginning, knowlegde is from Him, He gave man the tongue so the man can express his thoughts. Suh, I conclude God is everything and gave that power to The Christ.