Why unity argument doesn't work for Islam — Quran vs. Bible authorship

The Quran was composed by a single individual (Muhammad) over a 23-year span (609-632 AD), even if Muslims believe it to be eternally inscribed in heaven (Quran 85:22). By contrast, the Bible was written over 1,500 years by 30-40 different authors across multiple continents, in multiple genres (narrative, poetry, wisdom, apocalyptic, legal literature). The intricate theological consistencies across this diversity — especially on subtle matters like the divine plurality of God — are far more impressive and far less likely to have been humanly engineered than consistency within a single author's work.