'If anyone teaches a different doctrine and does not agree with the sound words of our Lord Jesus Christ and the teaching that accords with godliness, he is puffed up with conceit and understands nothing...deprived of the truth, imagining that godliness is a means of gain.' 2 Timothy 6

'Someone needs to say this plainly: The faith healers and health-and-wealth preachers who dominate religious television are shameless frauds. Their message is not the true gospel of Jesus Christ. There is nothing spiritual or miraculous about their on-stage chicanery. It is all a devious ruse designed to take advantage of desperate people. They are not godly ministers but greedy impostors who corrupt the Word of God for money's sake. They are not real pastors who shepherd the flock of God but hirelings whose only design is to fleece the sheep. Their love of money is glaringly obvious in what they say as well as how they live. They claim to possess great spiritual power, but in reality they are rank materialists and enemies of everything holy.

But false prophets also arose among the people, just as there will be false teachers among you, who will secretly bring in destructive heresies...and in their greed they will exploit you with false words.'  2 Peter 2

There is no reason anyone should be deceived by this age-old con, and there is certainly no justification for treating the hucksters as if they were authentic ministers of the gospel. Religious charlatans who make merchandise of false promises have been around since the apostolic era. They pretend to be messengers of Christ, but they are interlopers and impostors. The apostles condemned them with the harshest possible language. Paul called them "men of corrupt minds and destitute of the truth, who suppose that godliness is a means of gain"  Peter called them false prophets with "heart[s] trained in greed" He warned that "in their greed they will exploit you with false words" - He exposed them as scoundrels and dismissed them as "stains and blemishes" on the church...'

and we should do the same.

edited from John MacArthur sermon -- A Colossal Fraud