In the grand scheme of things, only that which is precisely within God's will, that is in agreement in thought and deed with him, can possibly live. If anything in opposition to him had the ability to maintain itself in such, that would prove that evil was actually in God, since ultimately only God is. That which is in opposition to God, cannot do so eternally, but only temporarily and only because there is purpose in it for a season. Evil is a vanishing mist.
Among those in flesh and bones, only Jesus lived precisely in God's will. He never strayed from that line, and never will. It is his chief demonstration of divinity, and it is backed-up by his resurrection from the dead. So among those in flesh and bones, only Jesus has life and knows how to live.
For any other being made in the image of God, life can only exist in being in Jesus. This "being in Jesus" is not merely a positional or theoretical conception, but an actual and active participation in his Spirit. The one in Jesus is recast in his image, and thereafter walks as he walks. His atonement may have been the means of getting a sinner out of death, but only living and walking in him, like him, can sustain life.
As Jesus is flesh and bones with the person of God dwelling in him, those that will live are flesh and bones with God's Spirit living in them. As he, humbled in the form of flesh, lived agreeably with his heavenly Father, so to will those that live walk humbly in their flesh agreeably with the Spirit of God. To have Jesus within is to live, to be without Jesus is death, because only Jesus lives.