[kabar]

So you have the Shias in competition with the Sunnis, Sufi, Wahhabi, etc..

So are Catholics and Protestants competitors? Or Jews?

These "competitors" still go on the Haj to Mecca and Medina at the same time. They pray together. 10% of Saudi Arabia is Shi'a. About 90% of Islam is Sunni.

[Darksheare]

No comparison with Christianity or Judaism.
Neither Christianity NOR Judaism are told to strike off the hands and heads of unbelievers.