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The Quran and the Hadith (where the "Gabriel" explanation is found) provide a scientific explanation for how a child’s gender and appearance are determined—an explanation that is now known to be factually incorrect.
If Gabriel is the source of this information, and the information is scientifically impossible, then the source cannot be the Divine Creator of human biology.
It posits that gender is determined by which parent "reaches the climax" first or which fluid is "superior."
Sahih al-Bukhari 3329: Abdullah bin Salam asked the Prophet... "Why does a child resemble his father, and why does he resemble his maternal uncles?" Allah's Messenger said, "Gabriel has just now told me the answer..." He then stated: "If the man's discharge precedes the woman's discharge, the child resembles the father, and if the woman's discharge precedes the man's, then the child resembles the mother."
Sahih Muslim 315: "The reproductive substance of the man is white and that of the woman is yellow. When they have sexual intercourse and the male's substance prevails over the female's substance, it is a male child... and when the female's substance prevails over the male's substance, it is a female child."
Modern genetics has proven that gender is determined solely by the chromosomes carried by the father’s sperm at the moment of conception. The father's sperm carries either an X or a Y.
"Gabriel" claims that the woman’s fluid (which he calls "yellow") determines the gender if it "prevails" or "precedes." In reality, the woman’s fluid (ovum or cervical mucus) has zero influence on whether the child is male or female. The father's sperm is the sole determinant of sex.
The Hadith confuses phenotype (looking like your uncle) with genotype (being male or female). While a child can look like their mother due to her genes, her "fluids" or "climax" have nothing to do with the child being a boy or a girl.
The Bible tells us that God "knits us together in our mother's womb" (Psalm 139:13) and that He is the author of life. If the "Gabriel" of the Al-Kitab and Hadith provides a "revelation" that contradicts the very biological laws God established, it stands as a primary evidence of human error.