"Jude 7 mentions eternal fire. Jeremiah 17:27 refers to a fire in this world, not in an afterlife. Ezekiel 20:47 also refers to a fire in this world."
Jude 7 says Sodom and Gomorrah "suffered the punishment of eternal fire."
Is Sodom and Gomorrah still burning to this day? The Bible clearly depicts the destruction of S&G as a physical act, in this world. But it describes them as suffering the punishment of eternal fire. So why isn't that "eternal fire" still burning...unless the word "eternal" is doesn't have to do with time...?
The fire referred to in Jeremiah and Ezekiel was, indeed, "fire in this world", as you put it...but it was the same type of fire: eternal, unquenchable. So are the palaces of Jerusalem still burning? Are the trees of Israel still burning? If that "unquenchable fire" or "eternal fire" eventually went out, maybe "unquenchable" or "eternal" doesn't mean what you think it means...?
You're not sure of the tense? It's pretty straightforward: it's present tense. It doesn't say "those who worshipED the beast and its image", does it? And there are four dimensions in the universe that we can experience through our senses: length, width, depth, and time.
"You're saying this isn't what the Bible actually says, yet this is how Christians have interpreted these passages for many centuries."
How "christians" have interpreted it, yes...remember, these are people who openly celebrate pagan holidays, like "christmas" and "easter" (didn't even bother to change the name for that one), and become hostile if you challenge them on it...yet, you will find no such "holy days" celebrated in the Bible, and much against them (Ishtar, for example, is mentioned by name in multiple places on the OT.) And I'm sure you've heard all the excuses for why it is "ok" to celebrate them. So, those people not interpreting the Bible correctly....? Not even remotely implausible.
"Just because these teachings sound horrible and unjust, it doesn't automatically mean that the Bible isn't really saying this stuff."
It means those "horrible and unjust teachings" never existed in the first place.
"Are you an annihilationist,"
"or do you not believe Hell is real at all?"
God, no. Hell is as real as anything.