Allah can’t do mental arithmetic

Blunder; Dividing the inheritance is a problem for Allah. He simply cannot add fractions, yet at the same time claims to have created the entire world. It is clearly man-made.
Example from the Quran (Surah 4:11–12)

Suppose someone dies and leaves behind:

2 daughters
a father
a mother
a husband

The Quran gives the following shares:

Daughters combined: 2/3
Father: 1/6
Mother: 1/6
Husband: 1/4

Addition

2/3 + 1/6 + 1/6 + 1/4 = 8/12 + 2/12 + 2/12 + 3/12 = 15/12

That is 125% of the inheritance. So, too much has been distributed.

The solution is human intervention. Islamic jurisprudence states:

The solution is to reduce all parts proportionally so that the total becomes 100%.

Therefore:

Daughters do not receive 2/3 but (2/3 × 0.8) = 8/15
Father receives (1/6 × 0.8) = 2/15
Mother receives (1/6 × 0.8) = 2/15
Husband receives (1/4 × 0.8) = 3/15
Together: 15/15 = 100%

Critical view: An omnipotent God could have arranged this immediately without mathematical ingenuity. This points to the human origin of the text.

Scholars consider this view: This is not an error but a “test of justice”; God gave “guidelines,” and it is up to humans to develop jurisprudence (fiqh) from them.

Adjusting the meaning as guidelines isn’t mentioned in the Quran, but was devised out of necessity to create a closed system in practice, to iron out errors, and to make the hereditary division “workable.”

The Quran provides the basic fractions, but if they are mathematically incorrect, Islamic jurists have had to develop ungodly additional calculation rules: