Ok, but your exegesis of this part of the verse states "when God's election occurred" so you are already assigning a time table. You cannot say that God is not time bound and then assign a "time."
God is not time bound, but in communicating with mankind, He certainly must use words related to time for our benefit. Not difficult at all.
God chose those who believe from "before the foundations of the world." God is timeless but the "world" is not. What this means is that mankind came after the foundation of the world and God "chose" who would believe "before" mankind was.
What I've been saying.
If He chose those who would believe before mankind was then all that He chose to be believers are born progressively after the foundation of the world.
Please study your own words here. To say "chose those who would believe" is not the same as saying "He chose to be believers". You've slipped in an idea that cannot be found in Scripture. Eph 1:4 certainly does NOT say that God chose anyone to be a believer.
Wait. If God chose believers "before the foundation of the world" as you state in your OP and since mankind did not exist "before the foundation of the world" then would not all that He chose to be believers become believers as they are born throughout the years?
You've just done it again: He didn't choose anyone to be a believer, and this verse, nor any other, says that. That complelely misunderstands who God chose, and for what purpose.
Or are you proposing that those who God chose are born believers already?
No, He chose those who would become believers, but not because He chose who would believe, as you've now inserted, twice.
But then, "experientially" there are no believers that will ever be holy and blameless since all sin. Your point is wasted.
Really? So the commands to be "Christ-like" is wasted on all believers then?

Someone should have told Paul that. He could have saved some ink.
Secondly, since God "chose" those who would believe, and since the action is a completed action (prior to an individual's birth), and since we are "created" (Eph. 2:10, κτισθέντες, aorist participle passive, not by our action) as workers for good works, and since salvation is apart of works (Eph. 2:9), then the works we do we do from salvation not for salvation.
This is the THIRD time in your post you've said "God chose those who would believe". Let's get this right. Do you believe Eph 1:4 teaches that God is the One who determines who will believe? Why or why not?
Yes, God has chosen believers to be holy and blameless. That's exactly what Eph 1:4 says.
It does not say or even suggest that God determines who will believe. But He certainly knows who will.
Consequentially, "working out our salvation with trembling and fear" does not refer to the first step of salvation (justification) but to the second step of salvation (sanctification) which is a life long endeavor.
I know that and posted that. Maybe my post was misunderstood.
However, the second step of salvation does not affect our ultimate salvation other than as it relates to rewards (1 Cor. 3). So "positionally" and "experientally" are not separate conditions but the same condition.
No, they aren't. Believers are immediately positionally sanctified because of having been placed or sealed in Him by the Holy Spirit. But many believers never become experientially sanctified. Too much grieving and quenching the Holy Spirit.
Mmm.. if He chose before (on time) mankind existed, and if He chose for purpose which (as stated above) He freely gives, and since God finishes what He started, then the purpose will be achieved.
The focus in 1:4 is to be holy and blameless in time. Of course all believers will be holy and blameless in eternity. That's not what He chose believers to be.
Which choice was a corporate choice?
God's choice of believers to be holy and blameless. What would lead one to think that God individually chooses each believer to be holy and blameless.
Wouldn't you think that God wants ALL of His children to have a "family resemblance", rather than just some of them?
I'll put it another way. He chose all of His children to have a family resemblance (Christ-like).
Because you stated "Seems Calvinists want this verse to say that God chose who would become a believer, but it sure doesn't say that." If God chose the believer before the foundation of the world (as the verse states) and since the believers were yet to be born when God made the choices (as per your parenthetical statement in your OP), then God most certainly knew who would become a believer.
I've never argued otherwise about God knowing who would believe, but that isn't the point. He chose all who believe to be holy and blameless. See above for my clarification.
Are you disagreeing with the verse I posted from Romans 1 or with Paul addressing his letters to the saints of the churches or both?
Neither. And again, I have no idea why you'd think I was disagreeing with Rom 1 or that Paul was writing to the saints.
What did I post that leads one to that wrong conclusion?