Christ's coming into the world and dying in time was premised on a specific Eternal Purpose and for a specific people known as the Elect or foreknown of God, 1 Pet 1:1-2
To God’s elect, exiles scattered throughout the provinces of Pontus, Galatia, Cappadocia, Asia and Bithynia, 2 who have been chosen according to the foreknowledge of God the Father, through the sanctifying work of the Spirit, to be obedient to Jesus Christ and sprinkled with his blood:NIV
Now Peter writes specifically to them [ chosen according to the foreknowledge of God the Father] this 1 Pet 1:20
20 He was chosen before the creation of the world, but was revealed in these last times for your sake. NIV
20 Who verily was foreordained before the foundation of the world, but was manifest in these last times for you,
Now the word foreknowledge in 1 Pet 1:2 and foreordained in Vs 20 are the same greek word in the original.
The Foreknown of Vs 2 were Chosen in Christ the foreordained One of 1 Pet 1:20, stated here Eph 1:4. Now that is what the foreknowledge of Vs 2 is referring to, and not as the false teachers tell us, that it refers to God foreseeing who by their own freewill will accept Christ when He is Offered to them ! That's just untrue ! No they are foreknown because God chose them in His Beloved foreordained Son, who was again, foreordained before the foundation of the world; In fact its the same phraseology usage as used in Eph 1:4 "before the foundation of the world"
Eph 1:4
4 According as he hath chosen us in him before the foundation of the world, that we should be holy and without blame before him in love: &
1 Pet 1:20
20 Who verily was foreordained before the foundation of the world, but was manifest in these last times for you,
That is no small coincidence, and He [Christ the Lamb slain from the foundation Rev 13:3] was manifest [via Incarnation] for you Peter writes in 1 Pet 1:20682
20 Who verily was foreordained before the foundation of the world, but was manifest in these last times for you,
That you being the Elect according to the Foreknowledge of God 1 Pet 1:2. Now if Our Gospel does not make this point clear and precise, as Peter surely does here, then we preach a false Gospel and a False Christ, its as simple as that !