Isn't "In the beginning" just another way to say "Once upon a time"?

Exactly!

No, not at all.

"In the beginning" - whether we're talking about the Hebrew "בראשית" or the Greek "ΕΝ ΑΡΧΗ" - refers very specifically to THE beginning (in both languages), much more so than can possibly be conveyed in English translations.

On the other hand, "once upon a time" is quite intentionally vague and nondescript in regards to chronological setting.

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Not 'once upon A time' but the creation of time--in the beginning.

Nope.

"Once upon a time" could mean 100 years ago, 500 years ago, etc.

"In the beginning" means just that.

Don't worry. On Judgement Day you can ask God to his face. But I know for a fact, you wouldn't have the nerve to.

Pretty much. Because the stuff that comes after it is a fairy tale. The order of things created is backasswards compared to what modern man now knows. You can't fault ancient man for not know anything about physics, cosmology, astrophysics and such, but you can certainly fault modern man for being stupid enough to continually believe it.

No, it can mean as well for many other things, in the beginning of the book, beginning of the movie. Etc

No. there's a fundamental difference. The beginnning is the very start. specific point in time. Once upon a time can be anytime. not specific. Why?

No, as crazy as it sounds, the narrator is actually asserting it's a true story of the beginning of everything.

Pretty wild, huh?

i think in the beginning means, well, in the beginning

So get some white-out and correct your little story books sonny.