I agree with most of what you wrote. I distinguish everlasting (without end) from eternal (without beginning or end). That might just be me.
God's life in us is literally the Holy Spirit taking up residence in us as His temple. That is when we receive eternal life.
Sorry - I forgot to close the italic flag. Another thing all that extra brain power ISN’T being used for. ;)
Remember that the Holy Spirit does not always dwell with man. We receive him when we are worthy, but that doesn’t mean he is camped on our doorsteps.
We just have to live our lives worthily! If we obey the Commandments and otherwise, do good deeds, we can expect his guidance.
Obiviously, there are people in the world who never know the blessing of having that guidance. More’s the pity!