While many answers to your question have already been supplied in links provided in other threads, let me just offer a summary of why we maintain that most of the TBN teachers are promoting "a different gospel:"

First, they believe in a different god than the God of the Bible. Their god is dependent upon the will and faith of fallen creatures. His will can be thwarted by the faithlessness of men. The God of the Bible is not dependent upon the will, faith, words, nor actions of His creatures. The God of the Bible is sovereign, and His desires and purpose cannot be thwarted.

Second, these teachers re-define faith, describing it as a neutral "force" which can be employed by any sentient being either for good or evil. The Bible defines faith as a quality of God which is comunicated to those chosen from among fallen Man. It is entirely a gift, given entirely at His sole discretion and pleasure for His own purpose and glory. It is not something which is innate to all men, nor something that can be conjured up at one's own discretion, nor something that can be imparted or cultured by repetition (like a mantra) or by any other form of religious oblation. Faith, according to the Scriptures, comes only as a gifted response to God's word, preached and heard by hearts that have been regenerated. The new birth is from Above. Not from within.

Thirdly, they teach that God is obligated to show mercy to anyone who asks. The Bible teaches exactly the opposite. God is under no obligation to save anyone. And if mercy was obligatory, it could not be called mercy at all! But the TBN teachers place Man in God's place as sovereign ("free will!") and put God at the mercy of our choices. Romans chapter nine (among many other portions of God's infallible word) clearly demonstrates that even the most wicked of men and all their plans are determined from eternity by Almighty God. He has mercy on whom He will have mercy, and gives justice to whom He will.

Word of Faith teachings are aimed at teaching people to manipulate ("enable") God into doing stuff for us, giving us what we want, and granting our desires. The Bible teaches the opposite: Dying to self, surrender, and sacrifice. Not giving in order to get, but giving out of sheer joy from hearts that have been made whole. It is we who should seek His desires, not the other way around. TBN's teachers sek to reverse the roles of God and Man, putting God in the place of a servant and portraying God and Satan as nearly equal opponents competing for the souls of men - with Man's will being the deciding factor.

TBN teachings are a damnable mixture of gnosticism with "Christian Science". They are designed to appeal to the twisted hopes of men who are uncomfortable with the fact that they are, from eternity, completely at the mercy of a holy, sovereign God.

When these teachings prove to be false in the lives of millions, these teachers bully their victims with shame and accusations and even threats. It's never that their teachings are wrong, it's always that we failed to congure up sufficient faith or sufficient obedience or sufficient funds ("seed") to reap the expected harvest of health and wealth and hapiness. And for most folks who have never heard the truth and who think they have tried Christianity and been disappointed, the result is abandonment to the world.

Been there, done that, got the teeshirt.

-Robin