> The Lucifer is always depicted from the Bible's point of view.
To the best of my limited understanding, very little is said of Satan, at all, in either the OT or the NT. What little is said, doesn't actually plainly state that the Serpent from the Garden of Eden is Satan, or that this is the same entity as Lucifer (or any other angel, fallen or otherwise).
Satan, as in the Christian Devil, is very much a thing of the Judeo-Christian mythology, the stuff that didn't make it into any of the books. Not much written down about it (think of what it might mean to be caught with such books?), just stories passed down orally, maybe in whispers.
> And the Bible insists that only its words are true. You must not trust anything else
I'm an atheist myself, but this seems like a particularly asinine interpretation of anything you might find in the Christian Bible.
I think you're all missing a conundrum that has some similarities to those we find in computer science. If you have two or more invisible, incorporeal entities, one or more of which may lie and be the impostor of the other, how can you determine who is who? What if some or all have multiple names? Can you even determine if there are multiple entities, perhaps you are mistaken and there's only one? For instance, when Mormons or Muslims say they worship the same deity as Christians, why should their opinion be taken at face value (regardless of whether you are a believer or atheist)?