[Legate of Amon Lanc]

Originally Posted by Morthoron

Well, the Numenoreans were worshipping a false god (Morgoth), and then there was that whole human sacrifice thing,

That's the main thing, I would say. In any case, in contrary to the story of Akallabeth, the biblical descriptions are usually pretty vague, but I have no doubt Tolkien was inspired by both, as well as Atlantis, as it has been already mentioned here too.

but if I recall the biblical version of the destruction of Sodom and Gommorah had more to do with sexual perversion and inhospitality (selfishness, lack of compassion).

Let me add a note here. The second one definitely, but the first one, not - seeing sexual perversion in it was only a later meaning added to the text by later interpretators. The story itself speaks mainly about inhospitability in the worst sense - visitors come to the city, and the inhabitants not only don't offer them what they can, but actually intend harm and violence towards them. The fact that it had something to do with sex is merely the "colorite" - it's just another form of the violence when you want to rape somebody who came to your house asking for a night stay there. But overall, if I took the story, I would say it is something I could imagine even on Númenor as it's depicted during Pharazon's rule (or perhaps even in some scale during the reign of the kings before him).