A true form of "spiritual warfare" is personally entering into God's rest and assisting others to the same. We have all things in Christ! We need do nothing to earn anything. We've had all of our sin completely removed, been given all of the benefits of Jesus' perfect life, and God himself now calls us his home--all moved in, paid off the mortgage and everything. We are completely secure with him, and have little to do but rest and enjoy him. And that's the battle--we don't believe it.
But what if we did? Battle won.