What you say sounds similar to a doctrine that speculates on what might have occurred if Adam and Eve had not eaten of the tree. It goes something like, God's creation was not complete by the 7th day, as man still had to eat the tree of life, but did not quite get there.
But I think mankind could not experience God's saving grace unless mankind was in a fallen condition.
I like this article which explains some reasons why the fall of man was part of God's perfect plan:
https://bible.org/seriespage/5-fall-...s-perfect-plan