That's why it's a parabolic act. In the end, God With Us is parable -- counter-intuitive. Jesus-dying-on-the-cross-for-our-sins is mythic -- larger-than-life. Jesus taught in parables -- not myths. It stands to reason, then, that since we seem to be disposed to turn away from God (as in the garden), that a parable -- not a myth -- will turn us around (as in repentance), which is what Jesus preached: "Turn your lives around, because God's kingdom has come (past tense) near."
We cannot become "as God." But God can become human. God didn't become "part-human." Read Philippians 2. God gave up Divinity to take on human form.
God limited God's Self like that, so that we could be reconciled, since we could not expand ourselves like that. We do need the "upgrade," and, in fact, have received that "upgrade" through being reconciled to God.