Christianity is INSIDE OUT:
Philippians 2:12-13
12 Therefore, my dear friends, as you have always obeyed--not only in my presence, but now much more in my absence--continue to work out your salvation with fear and trembling, 13 for it is God who works in you to will and to act according to his good purpose.
God works salvation into you.
Any guesses how you work it out?
My commandment to you is to love those who have wronged you and forgive them, starting with your own self; and be patient with those whom you have wronged. ~ Jesus [Letters from God and His Christ - Volume 6 - Bear Fruit According to the Spirit of Truth]