We agree that spiritual death is separation between us and God. However, when we receive salvation through the blood of Jesus Christ we are justified by Him (made clean of all sin- past and future). That is why if you watched that short 2 minute movie I put up yesterday when it was time for the one guy to be judged, Jesus stands in His place. That is exactly how it is.
Jesus is Our Advocate
1 John 2:1
1 My little children, I am writing these things to you so that you may not sin. And
if anyone sins, we have an Advocate with the Father, Jesus Christ the righteous;
2 and
He Himself is the propitiation for our sins; and not for ours only, but also for those of the whole world.
So your sentence
The degree to which an individual accepts God is the extent in which God can be with them in the eternities. is not the same. Now what Christ does give is Crowns and extra heavenly blessings. But everyone of His Children is the heir to His Kingdom.
The way it is in Christianity is on Judgement Day you either stand on your own merit OR Christ stands in for you. So salvation is sure.
But day to day to keep in faith, we have the indwelling Holy Spirit who is ALWAYS with us. He prays for us when we do not know what to pray for. He teaches us truth and the spiritual things of God. Convicts us of our sin. The Holy Spirit with our spirit confesses that we are Christ's Own. He is the downpayment of our inheritance in Christ Jesus until the Day of Redemption.
So we have God in us, helping us and convict us of our sin unto repentance.
"But the
fruit of the Spirit is love, joy, peace, forbearance, kindness, goodness, faithfulness, gentleness and self-control." Galatians 5:22-23.
Not us trying to be like God.
But God's Word does say that we will be held accountable for each word we speak and each thing we do. But that does not mean loosing eternity. I think that is where the crowns and blessings come in.