Jesus came down to earth for three reasons Bob, he said primarily to preach the good news of the Kingdom, like you mentioned Luke 4:43
He came to die as a sacrifice for what Adam lost, as you mentioned Rom 5:12
And although people never think of this, he came to prove that man can live a righteous life without sinning. Both perfect humans who existed prior sinned. He was able to prove satan a liar once again with his challenge to Jehovah recorded for us at Job 2:4, man can live a righteous life without violating any of God's laws. This will be a requirement after we are granted everlasting life.