So a Person has received Grace[experimentally] when they are given New Birth.; But again before Time began, every member of Christ's Body received Grace in Christ Jesus 2 Tim 1:9
9Who hath saved us, and called us with an holy calling, not according to our works, but according to his own purpose and grace, which was given us in Christ Jesus before the world began,
The Non Elect never receive Grace, because Grace is reserved for the Election Rom 11:5
Even so then at this present time also there is a remnant according to the election of grace.
I believe you to be correct in that all God is doing he is doing by election.
And we know that all things work together for good to them that love God, to them who are the called according to [his] purpose. Rom 8:28
We did not exist before the world began. But God's purpose and grace did.
Before the world began the Lamb was slain, (purpose) and before the world began the promise of the hope of eternal life was made (grace). The recipient of being slain and the receiving the promise of hope of eternal life would be the seed of Abraham. It was to Abraham and his seed the promises were made however Abraham has yet to receive the promises. This seed of Abraham is also the only begotten of the Father, Spirit The God, (see John 4:23,24 Greek online interlinear Scripture4all.org) conceived (being generated) in the virgin Mary by the Spirit is Holy. (Matt 1:20 also Greek interlinear.) This was determined 4000 years before it took place. God also knew at that time there would be the elect that would be saved by this purpose and grace.
BTW The Passover was that slain Lamb
The feast of unleavened bread was the cleansing of our sins by the blood of that slain Lamb after the resurrection. Washing
of regeneration and our continued being cleaned through confession of sin.
The feast of firstfruits began at Pentecost following the resurrection and is presently going on. By the firstfruits of the spirit a people are being called out of the nations for his name. The spring harvest, a remnant according to the election of grace.
The feast of trumpets the return of Jesus the resurrection of the fristfruits
the kingdom of God on earth with kings and priests from the election.
The day of atonement; the binding of Satan that he can not deceive the nations.
The feast of tabernacles The fall harvest and salvation of many the teaching and judgement of undeceived mankind when the residue of man might seek the Lord and the elect.
The day of the feast, the great day of the feast See John 7:37