Augustus
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I have many reasons to believe the Qur'an is written by a single author
Which of it do you find most persuasive?
Any articles you find particularly good?
There are no evidences to prove it was written by more than one unless it's a polemical argument but it's not evidenced.
There is no reason to start with the assumption that it was written by a single author though.
Given the purported story of its codification and the significant stylistic differences within, we wouldn’t assume a single author is more probable than multiple. We’d keep an open mind.
Seeing as most Muslims and non-muslims lack the specialised skills to judge it either way, over 99% of people are just going with an assumption either way.
IF it was written by several authors, it's logically possible, although it should be miraculous for several authors to have such coherence enough to dupe philologists and what we would call ilme maani.
Scholars have argued for a single author, against it and that it is currently inconclusive either way.
Whatever the answer is, many people have been “fooled”.
What makes you confident you are not one of them when more qualified scholars than you have made arguments for different origins?
I used to read a lot of scholarship on early Islam but became less interested when I kept reading different scholars both making plausible but contradictory arguments and had little way of deciding between them.