I've been chewing on this. I can't wrap my head around God picking and choosing who is saved and who goes to hell. I was thinking about this passage and can't possibly see how it is not the individual who chooses to serve God or not. Could you tell me how you understand this passage/analogy. The olive tree in Romans 11:16-24
Regarding your comment of not being able to wrap your head around "God picking and choosing who is saved
and who goes to hell", I would phrase it differently. The way I would phrase it is that all of us deserve to be under God's wrath, no one
deserving of salvation: "no not one". So, for those to whom it is to be freely given without works or preconditions, from an exceedingly merciful and gracious God, they indeed have been blessed far above all others. However, not all can believe that it is possible for God to be that merciful and gracious. However, should they become able to, it is only a result of having become saved.
If you think about it, the only way God's grace could be possible is only if it is given in conjunction with election: God's choice of those who are to freely receive His grace, otherwise, were it to be based upon something besides election, our works would then be necessary to satisfy it, but then it wouldn't/couldn't be by grace. The Bible makes it abundantly clear that no one can be saved by their works because to have to work for salvation is to be under law, but by law comes judgment. It was precisely for that purpose Christ's sacrifice took those who are to be saved from under the law (in addition to remitting their past sin), and hence, without law being present, no judgement is possible as there is nothing to judge us or assess sin: without the law there is no sin.
The elect, when saved, have been called to serve God, but that comes as a result of salvation not to bring salvation.
The unsaved cannot/do not know the true gospel, and therefore, while they may think they're serving God, by their works, and their teaching of others likewise, they are actually serving Satan not God.
[Rom 7:8-11 KJV]
8
But sin, taking occasion by the commandment, wrought in me all manner of concupiscence.
For without the law sin [was] dead.
9 For I was alive without the law once: but when
the commandment came, sin revived, and I died.
10 And the commandment, which [was ordained] to life,
I found [to be] unto death.
11
For sin, taking occasion by the commandment, deceived me, and by it slew [me].
If I correctly understand the crux of your request, it focuses particularly on verses 11:22, 23, 24.
[Rom 11:22-24 KJV]
22 Behold therefore the goodness and severity of God: on them which fell, severity; but toward thee, goodness, if thou continue in [his] goodness: otherwise thou also shalt be cut off.
23 And they also, if they abide not still in unbelief, shall be graffed in: for God is able to graff them in again.
24 For if thou wert cut out of the olive tree which is wild by nature, and wert graffed contrary to nature into a good olive tree: how much more shall these, which be the natural [branches], be graffed into their own olive tree?
I think the resolution is as follows:
For 11:22, certain people manifest a faith in Christ, but it is a transient faith produced by man's intellect, and therefore, not a true faith. A true faith is one given by the Holy Spirit and manifests itself into the heart: a renewed heart which is given to them by God through becoming born again. IOW one faith if from man's unsaved brain, the other, of the saved heart. The faith produced by unsaved man's intellect, being transient, will not endure. Consequently, in verse 11:22, we are told that if one continues in faith, it is only because that faith is from God's goodness and was given to them from salvation; the others, with the transient faith, and yet even having had a passing intellectual knowledge of Christ yet fall away, they remain under God's wrath as do all those not so chosen to salvation.
For 11:23, to not abide, is to not believe. True belief comes from the faith of Christ, which faith, is imputed to those whom He had chosen to salvation. At a time of God's choosing, those who had been so chosen to salvation, become born again and with it, Christ's faith is imputed, from which, comes true belief in Him as Saviour results from spiritually hearing the gospel. Those for whom it occurs, because it occurs, and by it occurring, have thereby been grafted back in.
For 11:24, it is saying that for those raised within the foundation of the Jewish religion (the natural branches), for those of them whom God removes the veil from their eyes through the imputing to them of the faith of Christ and all that goes with it, their adaption to and grasp of, the doctrines of Christianity are more naturally accomplished than for those not having the same kind of background.