

Cutting out philosophical arguments, prophecies and “no way this is a coincidence” types of stuff (which, yeah, there’s a lot of those), it’s a combination of
We will show them Our signs in the horizons and within themselves until it becomes clear to them that it is the truth. But is it not sufficient concerning your Lord that He is, over all things, a Witness?
-Quran 41:53
They have taken their rabbis and monks as lords besides Allah and also the Messiah, son of Maryam (Mary), though they were commanded to worship only One God. There is no god except Him. His Glory is far above any partners they ascribe (to Him).
-9:31
And let not those who [greedily] withhold what Allah has given them of His bounty ever think that it is better for them. Rather, it is worse for them. Their necks will be encircled by what they withheld on the Day of Resurrection. And to Allah belongs the heritage of the heavens and the earth. And Allah, with what you do, is [fully] Acquainted.
-3:180
Of course there’s a lot more where that came from, but the point is: We here have a religious text that encourages independent thought and pondering of the world and itself, promises harsh punishment for hoarding wealth and unequivocally condemns priestly institutions. Does that sound like an attempt to gain wealth or power? Exactly. Also this
He [Muhammad] looked displeased and turned (his attention) away, because a blind man came to him (interrupting his discourse). What would make you realise? Perhaps he would purify himself (by your attention),
-80:1-3
is not how a cult leader talks about himself. It’s admittedly hard to parse from the translation, but this is a somewhat harsh admonition of Muhammad here. The segment continues until verse 10 if anyone wants continue reading, but the gist of it is “you’re ignoring the man seeking guidance and trying to convince those who reject it? That is not how that works. Yes, even if it’s a random blind guy.”

Could you expand (or link to something that expands) on the Solomon thing?