I understand your point, I believe it comes down to a matter of perspective. I personally believe that the Word of God should not be simple. If it comes from the God who created the universe and the incredibly complex nature we observe today, simplicity and easy memorization would not necessarily be characteristics of such a powerful God. I also feel more comfortable believing in a book that places itself under historical scrutiny by including what many might call “superfluous” historical details—details that have in fact been crucial for archaeology for centuries—which makes it empirically verifiable. A book written purely by human effort would not be able to achieve this.The two are indeed very different. The Qur'an is not a history book arranged into chronological chapters as an unfamiliar reader may assume. On the contrary, it is a Book of guidance teaching us about God's message for the whole of humanity. The Qur'an has a unique, sophisticated structural coherence such that its key messages are embedded throughout, allowing everyone to benefit from it irrespective of how much they read. That is, a person does not need to read the entire or large portions of the Qur’ān in one sitting to find out what God wants from us. This also facilitates regular reading, reflection and memorisation. The narratives of the Qur'an are lesson-oriented, thus they are presented in ways that reinforce and highlight contextual themes and messages, with superfluous details such as precise geographic location or detailed genealogy intentionally omitted to maintain focus on the goals of each narrative.
A important fact to me is that the Bible was not written by a single person, but by around 40 authors, including kings, very poor individuals, and people from vastly different backgrounds. Many use this as an argument against the Bible, and I would agree—if the Bible did not agree so strongly with itself from beginning to end. The Bible contains more than 63,000 cross-references, proclaims over 300 Messianic prophecies (both implicit and explicit), and fulfills them within the same book (the Bible). It also presents a theological depth so complex that entire bachelor’s degrees are dedicated to studying it. It is virtually impossible for a book written by 40 different people to contain over 63,000 cross-references and maintain such internal consistency unless the ultimate author were the same—namely, God.
Furthermore, relying on the testimony of a single individual is extremely dangerous, something that history—and religion—clearly confirms. Numerous dictators with emotionally compelling speeches have convinced millions of people to commit absurd and horrific acts. In the religious sphere, Muhammad’s story has been repeated many times throughout history. For example: Zoroaster claimed visions and revelations from Ahura Mazda and founded Zoroastrianism; Joseph Smith claimed to receive the angel Moroni, who gave him the Book of Mormon (a case strikingly similar to Muhammad’s); sages received the Vedas through the cosmic being Brahman; Egyptian pharaohs received religious texts through divine visions and revelations, and so on.
The list goes on, and Muhammad’s revelation fits the same pattern as all these others. To be honest, similar experiences did occur in Christianity as well (Paul, for example, who is heavily criticized within Islamic circles). However, in Christianity these experiences occurred to dozens of different people, across different continents, speaking different languages, over a period of more than 1,500 years, all pointing consistently to the same God. As I mentioned earlier, the text contains more than 63,000 cross-references and maintains coherence from beginning to end. There is no literature—religious or otherwise—in the world that compares to the Bible in this regard. Above all, it is historically verifiable, and therefore no one can reasonably claim that it was simply invented.