Where did lay Muslims get the idea that the 1924 Cairo edition of the Qur'an is an unchanged 'Textus Receptus' going back to Muhammad himself? Protestants? Textual variants, even within the Uthmanic tradition, are well documented, and Uthman's codex is likely not identical to Muhammad's revelations—as per lbn Mas'ud

Admitting this doesn't necessarily undermine Islamic doctrine nor scriptural veracity—except perhaps in questioning how similar Uthman's recension is to Muhammad's. Most known variants within the Uthmanic Qur'an are theologically minor, being closer in nature to New Testament textual variance than to the Old

So what caused this apologia to emerge?