The proof of whether you believe something is when you put it into action and do it.
What should identify Christians to the world is not our doctrine, even though that is very important, but our actions.
Ask yourself: does your fruit look and taste any different than the fruit of the world?
Gal 5:19-22
What are you exhibiting at home, at work, at the drive through?
If we exhibit worldly fruit, we won't enjoy the benefits of the fruits of the Spirit. It's like a teen who runs away; they are no longer enjoying the safety of the home, the home cooked meals, the comfort, even though they are still part of the family.