Wouldn't it be great if we could know for sure if we or someone else was a real Jesus follower? People may not have holograms that you can check (like people look at counterfeit money), but we do have 1 John. This book is small but though provoking and heart searching. It helps us understand why people leave Jesus (after it seems they found salvation) and it helps us know if we are deceiving ourselves about our salvation. Being a Christian is way more than what you do... its who you are.