This is a question about the core foundational beliefs of the faith of Islam.
The central claim of Islam is that Allah communicated the truth to Mohammed. All well and good so far – who could possibly question such a claim!!!
However to many sceptics this looks like mythology based on absolutely nothing – and that’s being kind.
So which is more likely:-
Likelihood A) :Islam is 100% fiction (made up of stories cobbled together over hundreds of years created entirely from the culture of the people who lived on the Arabian peninsula thousands of years ago additionally using ‘copy and pastes’ from the Bible & Torah – themselves pure fiction). The stories based on nothing more than anecdotes of thousands of unknown charlatans, chancers, ranters, vagabonds, ne’er-do-wells, liars, power grabbers, thieves and warlords
OR
Likelyhood

Islam is 100% true:- It really was Allah-the one and only creator of the Universe- talking to a prophet (a man who was as real as anyone reading this but who is deserving of vast limitless worship -the reasons why are not relevant here)
Also where the many (hadith) writers were not like the mix of selfish, child-men, egomaniacs, we see in the world today – they were somehow altruistic truth tellers with no other agenda other than to write & embellish these stories (that they never witnessed in the first place)
So, which is most likely? This is not a question addressed at the level of Islamic theologians of the ages but simply at the level of honest objectivity, now in the 21st century.
Put in another way, given that the age of enlightenment decisively ended in Europe approx. 220 years ago:-
Why do well-travelled, highly educated Muslims think non-Muslim intellectuals, anthropologists or sociologists, having dismissed as many as 20,000 other religions of human history (-including Christianity, Judaism or for example Pacific cargo cult religions) as primitive manufactured myths, should not similarly dismiss Islam as superficial nonsense?