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Matthew 7:15-23 KJV

Beware of false prophets, which come to you in sheep's clothing, but inwardly they are ravening wolves. Ye shall know them by their fruits. Do men gather grapes of thorns, or figs of thistles? Even so every good tree bringeth forth good fruit; but a corrupt tree bringeth forth evil fruit. A good tree cannot bring forth evil fruit, neither can a corrupt tree bring forth good fruit. Every tree that bringeth not forth good fruit is hewn down, and cast into the fire. Wherefore by their fruits ye shall know them. Not every one that saith unto me, Lord, Lord, shall enter into the kingdom of heaven; but he that doeth the will of my Father which is in heaven. Many will say to me in that day, Lord, Lord, have we not prophesied in thy name? and in thy name have cast out devils? and in thy name done many wonderful works? And then will I profess unto them, I never knew you: depart from me, ye that work iniquity.

I can tell everyone I meet today that I am a doctor. I can use catch phrases I picked up in my limited medical training and from TV and the internet. I can even dress like a doctor and wear a stethoscope.
But I would risk the chance of having my bluff called when something happens and I'm asked to help. The talk and look may come easy, but the exercise of my training cannot be faked.

The same applies to being a Christian. Satan seeks to devour us. The lost, he wishes to keep lost. The saved, he wishes to destroy our lives and testimony.
But if we are what we claim, when called to exercise our faith, we shine as the city on the hill.
But if we are a fraud, we turn to sin and vice. Our bluff is called, and Satan has the winning hand.
Christians are not perfect, but if your fruit only shows vice, Jesus says we are to judge you as lost. Not to condemn you, you do that yourself, but to reach you with the Gospel. If you refuse, I refuse to lie about you once you are gone.

2 Peter 1:10 KJV

Wherefore the rather, brethren, give diligence to make your calling and election sure: for if ye do these things, ye shall never fall: