THE ROOT OF SUNNI-SHIA SCHISM

The Sunni-Shia schism emanated from these two formulas.

1. Muhammed(un) (who's the Arabian Christ) = Abd Allah (i.e. servant of Allah), where Abd Allah was later redacted to Abdullah  (I.e. alleged father of Muhammed) by the Abbasid political elites.

2. Muhammed(un) (who's the Arabian Christ) = W(Ali) Al-Amir Allah (i.e. the exalted representative of Allah), where W(Ali) was later redacted to Ali (I.e. the fabricated son-in-law of Muhammed).

As expected, the created object of Muhammedanism, who's Muhammed(un), had no male heir, making patrilineal succession difficult - note: originally, the word "Muhammed" was not a personal name; rather, it's a phrasal commendation, meaning "praise be" (I.e. praise be to Isa Ibn Maryam).

It suffices to say that the Western Arabs (the Ghassanids) adopted the first formula and created succession based on their Caliphate system while the Eastern Arabs (the Lakhmids) and the Sassanid Aristocrats of Iran adopted the later and created succession based on the fabricated family relationship between Ali and Muhammed(un). This explains why the Iranians are mostly Shites and the Saudis are mostly Sunni.

In conclusion: Muhammedanism, now Islam, was formulated by the Umayyad Caliph (Abd Al-Malik). It was later reformulated by the Abbasid Caliph (Al-Ma'mun). And its was finally consolidated by the Ottomans.