Islam puts all its eggs into one basket, proof from the Qur'an itself that it is a book from the Creator.
[2:23] And if you are in doubt as to what We have sent down to Our servant, then produce a Chapter like it, and call upon your helpers beside Allah, if you are truthful. But if you do it not — and never shall you do it — then guard against the Fire, whose fuel is men and stones, which is prepared for the disbelievers.
This is a warning as well as getting mankind to think for themselves about His Message.
Just quick history: the time when the Qur'an was revealed, the Arabs were of the best poets. So when the Quran was revealed, they were amazed. they did not become Muslims but admitted that his was NOT human speech. So what can it be?
This verse has stood for over 1400 years. The best of the experts have not been able to come up with just one verse in the Arabic language to disapprove it.
If it can be disapproved, I will leave Islam.
I have yet to come across this in Christianity. What would hold the people to the Bible?