that's just the official reason and the start of a wedge that would have already been lying in peoples heart latent. it can only be taken as face value as far as the early arabs go. it took root in iran much easier however because the indo aryan respected the divine right of blood kinship more than arabs, overall. christianity had succession problems as well but there was always underlying issues that can be traced to the blood of a people. the iranians are not semites so islam which was forced upon them had to naturally turn into something that could make sense to their soul.
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