Isaiah 46:10-11 proves that from God's own perspective that He does not view His eternal purpose as accomplishing anything apart from Him actually carrying it out in time and space -
"I have purposed it, I will also do it."
Notice the different tenses. In regard to his purpose it is a past tense completed action "I HAVE purposED it". However, in regard to the implementation of that purpose it is a future tense "WILL do it."
Hence, God does not view his own purpose as actually accomplishing anything but is something not yet done but something future to "do." It is accomplished in the future by His own power and perdetermination to "do it."
Hence, His purpose is no different than a blue print of a house before it is built and accomplishes nothing more than a blue print accomplishes in the actual building of a house. Because the builder has a blue print of the house before it is actually built he foreknows every room, every windom, every light socket because He has purposed those things before hand but like the builder God must implement his plan by his own action in time and space.
Hence, we were purposed to be regenerated before the world "according to His purpose" but we were not regenerated before the world at all until the Holy Spirit actually carried that purpose out in time and space.
Hence, Christ was purposed as the redemptive lamb before the world "according to His purpose" but He was not the redemptive lamb before the world at all until He actual came and carried out that purpose in time and space.
Those who attempt to contradict the plain statement of God in Isaiah 46:11 by saying we were "objectively" saved before the world began are simply deceivers as we were not saved before the world began in any way shape or form but by Divine intent and design which God Himself does not regard as actual - "I WILL do it" not "I HAVE done it."
No I am not answering that question, if one does not know why the Gospel should be preached, that is too bad.
And to you who denies Justification by the blood of Christ alone, which the resurrection gives evidence of : Read this Rom 4:25
25Who was delivered for[because of] our offences, and was raised again for[because of] our justification.
The resurrection is an open vindication of all for whom Christ died for their sins !
If He would not have risen, it would have meant that all for whom He died remained in their sins 1 Cor 15:14,17
14And if Christ be not risen, then is our preaching vain, and your faith is also vain.
17And if Christ be not raised, your faith is vain; ye are yet in your sins.
The resurrection indicates that God has forgiven those Christ died for, and Justified, and God given Faith embraces that Truth ! You reject the clear testimony of the Justification of God's People by the Death of Christ ! In essence, you believe like every other work monger, that Justification before God depends on man's act of faith or believing,
so you believe in salvation by works !