The passage is Eph 1:4 "just as he chose us in Christ before the foundation of the world to be holy and blameless before him in love."
As noted, I think the issue here is more Calvinism than open theism. The usual non-Calvinist understanding is that God intended from the beginning to send Christ and through him to call a people. This need not indicate predestination of individuals.
You are stretching the text. He chose us in Him before the foundations of the earth. Us chosen apart from time . The text does not support a generic corporate choosing but individual.
Confirmed later in Ephesians 1:
In Him 11also we have obtained an inheritance, having been predestined according to His purpose who works all things after the counsel of His will, 12to the end that we who were the first to hope in Christ would be to the praise of His glory. 13In Him, you also, after listening to the message of truth, the gospel of your salvation—having also believed, you were sealed in Him with the Holy Spirit of promise, 14who is given as a pledge of our inheritance, with a view to the redemption of God’s own possession, to the praise of His glory.
Acts 2:23 and this passage don't talk about God having determined the specifics from the beginning. Obviously God intended Christ to be crucified and resurrected, in those circumstances. But this passage lacks what Eph says, from the beginning. It's perfectly plausible to say, with Eph, that God intended from the beginning to send Christ, but that the specific way he was to die depending upon the historical situation.
The text actually says
foreknowledge and
Predetermined. And words truly having meanings which can't be massaged into meaning what we want them to mean.
Predetermined:
horizó: to mark off by boundaries, to determine
Original Word: ὁρίζω
Part of Speech: Verb
Transliteration: horizó
Phonetic Spelling: (hor-id'-zo)
Definition: to mark off by boundaries, to determine
Usage: I separate, mark off by boundaries; I determine, appoint, designate.
3724 horízō (from
horos, "boundary, limit") – properly, to set boundaries (limits) – literally, "determine
horizons" (
boundaries).
3724 /horízō ("designate limits, boundaries") refers to the Lord (literally) "horizoning"
all the physical scenes of life before creation. This guarantees God works each in conjunction with His eternal
purpose (providence, see
4286 /próthesis).
[The English term "
horizon" ("
horizoning") comes from
3724(
horízō), "to set
limits."
4309/proorízō ("
pre-horizon,
pre-determine") emphasizes God's
eternality with
its correlations, as operating in His perfect wisdom, absolute foreknowledge, etc.).]
2. to determine, appoint: with an accusative of the thing, ἡμέραν,
Hebrews 4:7; καιρούς,
Acts 17:26(numerous examples from Greek authors are given in Bleek, Hebrew-Br. 2:1, p. 538f);
passive ὡρισμένος, 'determinate,' settled, Acts 2:23; τό ὡρισμένον, that which hath been determined,according to appointment, decree,Luke 22:22; with an accusative of person
Acts 17:31 (ᾧ by attraction for ὅν (Winers Grammar, § 24, 1; Buttmann, § 143, 8)); passive with a predicate nominative,
Romans 1:4 (for although Christ was the Son of God before his resurrection, yet he was openly appointed (A. V.declared) such among men by this transcendent and crowning event); ὁρίζω, to ordain, determine, appoint,
Acts 10:42; followed by an infinitive
Acts 11:29 (Sophoclesfrom 19 d. (i. e. Aegeus (539), viii., p. 8, Brunck edition)). (Compare: ἀφορίζω, ἀποδιορίζω, πρωρίζω.)
Foreknowledge:
prognósis: foreknowledge
Original Word: πρόγνωσις, εως, ἡ
Part of Speech: Noun, Feminine
Transliteration: prognósis
Phonetic Spelling: (prog'-no-sis)
Definition: foreknowledge
Usage: foreknowledge, previous determination.
HELPS Word-studies
Cognate: 4268 prógnōsis (from
4267 /proginṓskō, "foreknow") – properly,
foreknowledge.
4268(
prógnōsis) occurs twice in the NT,
both times of "God's absolute foreknowledge." See 4267(
proginōskō).
2.
forethought, prearrangement(see προβλέπω): 1 Peter 1:2; Acts 2:23
Strongs 4267
proginóskó: to know beforehand
Original Word: προγινώσκω
Part of Speech: Verb
Transliteration: proginóskó
Phonetic Spelling: (prog-in-oce'-ko)
Definition: to know beforehand
Usage: I know beforehand, foreknow.
HELPS Word-studies
4267 proginṓskō (from
4253 /pró, "before" and
1097 /ginṓskō, "to know") –
properly, foreknow; used in the NT of "God pre-knowing all choices –
and doing so without pre-
determining (requiring) them" (G. Archer).
Acts 4:28: to do whatever Your hand and Your purpose predestined to occur.
Your Hand
cheir: the hand
Original Word: χείρ, χειρός, ἡ
Part of Speech: Noun, Feminine
Transliteration: cheir
Phonetic Spelling: (khire)
Definition:
the hand
Usage: a hand.
5495 xeír – properly,
hand; (figuratively) the instrument a person uses to accomplish their purpose (intention, plan).
ἐμπεσεῖν εἰς χεῖρας Θεοῦ ζῶντος,
Hebrews 10:31. δ.
in determining and controlling the destinies of men: Acts 4:28; ταπεινοῦσθαι ὑπότήν κραταιάν χεῖρα τοῦ Θεοῦ, 1 Peter 5:6.
Purpose
boulé: counsel
Original Word: βουλή, ῆς, ἡ
Part of Speech: Noun, Feminine
Transliteration: boulé
Phonetic Spelling: (boo-lay')
Definition: counsel
Usage:
counsel, deliberate wisdom, decree.
1012 boulḗ – properly, a
resolved plan, used particularly of the
immutable aspect of God's plan – purposefully arranging
all physical circumstances, which guarantees every scene of life works to His eternal purpose.
This level of God's
plan (
1012/boulḗ) demonstrates He is
the Lord of history, i.e. always in charge!
[
1012 (
boulḗ) is more than God's immutable plan of physical circumstances. It always also includes the Lord's
purpose in them – and hence arranging all the physical scenes of history before creation (Ps 139:16; Jn 1:3).]
βουλή, βουλῆς, ἡ (βούλομαι), from Homer down; often in the Sept. for עֵצָה; counsel, purpose:
Luke 23:51(where distinguished from ἡπρᾶξις);
Acts 5:38;
Acts 27:12 (seeτίθημι, 1 a.), 42; plural
1 Corinthians 4:5; ἡ βουλή τοῦ Θεοῦ,
Acts 13:36; especially of the purpose of God respecting the salvation of men through Christ:
Luke 7:30;
Acts 2:23;
Acts 4:28; (
Hebrews 6:17); πᾶσαν τήνβουλήν τοῦ Θεοῦ all the contents of the divine plan,
Acts 20:27; ἡβουλή τοῦ θελήματος αὐτοῦ the counsel of his will,
Ephesians 1:11.
Predestined
proorizó: to predetermine, foreordain
Original Word: προορίζω
Part of Speech: Verb
Transliteration: proorizó
Phonetic Spelling: (pro-or-id'-zo)
Definition: to predetermine, foreordain
Usage:
I foreordain, predetermine, mark out beforehand.
4309 proorízō (from
4253 /pró, "before" and
3724 /horízō, "establish boundaries, limits") – properly,
pre-horizon, pre-determine limits (boundaries) predestine.
[
4309 (
proorízō) occurs six times in the NT (eight in the writings of Paul). Since the root (
3724 /horízō) already means "establish boundaries," the added prefix (
pro, "before") makes
4309 (
proorízō) "to
pre-establish boundaries," i.e.
before creation.]
προορίζω: 1 aorist προορισα; 1 aorist passive participle προορισθεντες; to predetermine, decide beforehand, Vulg. (except in Acts)praedestino (R. V. to foreordain):
in the N. T. of God decreeing from eternity, followed by an accusative with the infinitive Acts 4:28; τί, with the addition of πρό τῶν αἰώνων
1 Corinthians 2:7; τινα, with a predicate acc, to foreordain, appoint beforehand,
Romans 8:29f; τινα εἰς τί, one to obtain a thing.
Ephesians 1:5; προορισθεντες namely, κληρωθῆναι,
Ephesians 1:11. (Heliodorus and ecclesiastical writings. (Ignatius ad Eph. tit.))
You can't take a phrase from Ephesians and tack it onto a passage from Acts. I think Ephesians does in fact say that God intended to send Christ from the beginning, and God intended to call a people through him. That doesn't establish detailed predetermination.
No Ephesians is clearly saying
"us" in Him. Us as in those in Christ were chosen so from before the foundations of the earth. One would have to have a predetermined concept this chapter is not speaking of individuals.
See Strongs 4309 above. The NT use is always from eternity.
This isn't post-modernism. It's taking seriously the many Biblical passages about God responding to people.
Responding according to His Will and Purpose. Shall we review God's will and Purpose in Scriptures? And then compare how many times the will and intentions of mankind are mentioned?
You keep mentioning there are passages supporting open theism but you present none. Maybe I missed it.