Loyalty is the costliest virtue that exists: it includes your life. Disloyalty is the costliest vice that exists: it includes your soul.
How do we prove to God that we are Christians?
1. Accept Christ.
2. Let go and let God.
3. Accept no substitutes, cults, or people who just seem to have things down too pat.
God is the Judge. He sent Jesus here to learn what misery was. When Jesus returned with His report, things changed in Heaven and on earth.
It isn't how much you do that convinces God: it is the sort of things you do, and why you do them.
I believe we call that a conscience.