My friend: The sign and proof of one being a Christian is by their Fruitful LIFE the world sees and hears, for they Walk in Light. Anyone can witness their Love, Compassion, Kindness, Forgiveness and Selflessness in their words and deeds, resulting from their changed inner man flowing through their Thoughts and Intents of their heart by the Domination of CHRIST or The Spirit of GOD in them...World can easily know a True Christian from their Life of: Righteousness, Justice, Love, Respect, Compassion, Forgiveness, Selflessness and Peace for all!!! Become and be a True Christian my friend!!!!