God created Adam to be the origin of the ideal man and the ideal family on earth. But because Adam fell and began this sinful world, Jesus came to restore the original ideal world in the capacity of the Second Adam (I Cor. 15:45).
Therefore, the Lord of the Second Advent comes to complete the overall task of restoration and purpose of creation as the Third Adam. Therefore, he must come in the flesh, and become the origin of the ideal individual and the ideal family, and realize the Kingdom of Heaven on earth, which has been God's eternal ideal.