'Finished' is more apt, actually. 'Perfect' is not contextually accurate.
Beginning in jr. high until the end of high school I learned Spanish. By the end I was thinking in it and speaking it fluently. I know by experience that all words do not translate into all languages. But I also know there are definitions for each word in each language, and these two concepts don't match. 'Perfection' even in the English explanation you use, does not mean 'to serve it's purpose'. 'To perfect' as a verb, is also not the same as when its used as an adjective.
I would have to respectfully disagree on that. Perfect/perfection as the dictionary defines it includes bringing something to completion:
perfect [adj., n. pur-fikt; v. per-fekt]
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per·fect
 
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 /adj., n. ˈpɜr
fɪkt; v. pərˈfɛkt/
Show Spelled[adj., n. pur-fikt; v. per-fekt]
Show IPA
adjective 1.conforming absolutely to the description or definition of an ideal type: a perfect sphere; a perfect gentleman.
2.excellent or complete beyond practical or theoretical improvement: There is no perfect legal code. The proportions of this temple are almost perfect.
3.exactly fitting the need in a certain situation or for a certain purpose: a perfect actor to play Mr. Micawber; a perfect saw for cutting out keyholes.
4.
entirely without any flaws, defects, or shortcomings: a perfect apple; the perfect crime.
5.accurate, exact, or correct in every detail: a perfect copy.
verb (used with object)
18. to bring to completion; finish.
19. to bring to perfection; make flawless or faultless.
20. to bring
nearer to
perfection; improve.
2
1. to make fully skilled.
22. Printing .
to print the reverse of (a printed sheet).
Origin:
12501300; <
Latin perfectus, past participle of perficere
to finish, bring tocompletion (
per- per- +
-fec-, combining form of
facere to
do1 + -tus
past participle suffix); replacing Middle
English parfit <
Old French <
Latin as above
there are several ways the word 'perfect' or 'perfection' applies to the 'Adam and Eve story. And it is the right word to use.