If Muslims suggest that the understanding of science shown by their prophet Muhammad is so profound as to be supernatural, then they must accept that if Muhammad gets any science wrong, then he cannot be a messenger from God.
There are two particular statements which fall into my area of expertise:
1)where sperm/semen comes from
2) how many joints there are in the body
I will deal with the latter first as it is easier to deal with
This is undeniably and provenly wrong. Even more revealing, we find that Chinese philosophers said there were 360 joints in the body. So we see that “Muhammad” had an earthly fallible source for his “amazing knowledge”.
We find in the Koran this:This also is very definitely not true! As everyone knows, the spermatazoa come from the testes, and the semen is produced by the addition of fluid from the seminal vesicles and the prostate. Nowhere near the ribs!
So again Mohammed is proved wrong!
So Mohammed did not hear from God, but the deceiver, the Father of Lies, the fallen angel, Lucifer himself.