Some reasons why Quran is so persuasive (to many people)

[Angrboda]

You're missing several things, Mystic.

First, the greatest determinant of faith is one's immediate family, and one's immediate culture. Religious truths are efficiently communicated this way because our species evolved for this to be so. When Clovis points were the best hunting technology, those humans who were best able to transmit that technology to their children were the most successful. Transmitting beliefs from culture to individual, and from parents to child, works because that efficient transmission is of great benefit to our species.

Second, you're assuming the form we have it in now is the form it started out as. Religious technology, just like any other, evolves through a process of selection, selective refinement, and innovation. Just like any other set of memes, those memes that work become more common, becoming orthodoxy, and those that don't simply disappear. Those sayings of the Hadith which were effective were repeated more often than those that weren't. And those aspects of the faith which reinforced the power of those in control were themselves reinforced by those in control.

Take the Hadith for example. Why do we even have the Hadith if the Quran is what they say it is? The Hadith is like the Talmud. It's not officially true, but by determining how we interpret what is true, it effectively is.