Should be understood that prosperity gospel is not about God rewarding us for for our good deeds, led by the Holy Spirit, using finances or earthly possessions. Yes, there may be times and occasions where God may choose to go that route.
Prosperity teachers teach to have 'faith in your own faith', you are to believe that you 'create' your reality by the words you speak. 'Prosperity' comes from 'speaking it into existence using faith in your words' and that God will just come in and give it to you.
Also, the other way to get rich, give to their ministry. Many of them twist scripture to convince you of concepts such as the 'hundredfold blessing'. You give a dollar to their ministry, God will give you $100... you give $10,000 God will magically grant you $100,000. Give a car, God will reward you with 100 cars. Etc... giving to get is the idea. Not giving to help.
Also common teachings are that salvation did not happen on the cross. But that when Jesus 'took on the nature of Satan' on the cross, when he died he was dragged to hell for 3 days of torment in hell. Then God resurrects Christ, renewing his spirit as well, making Christ become the 'first born again man'. Salvation didn't occur til the resurrection, not on the cross. One preacher said if salvation were capable from the cross alone, that 'any born again man' could have saved us.
In true faith theology God is a screw up, and a genie in a bottle. And some teach we are actually all 'gods' ourselves. The power to get rich comes from our own faith in faith, which they consider to be an actual 'substance' in the universe. This exact teaching is found, reworded, in metaphysical cults and new age teachings.
These are just a few of the issues with the doctrines of Word of Faith/prosperity gospel. They keep going, all just as bad. Deifying man, making God just a bellhop for humanity, faith in ourselves rather than God. Placing words with 'faith' behind them as the ability to speak things into existence. Removing salvation from the cross and into hell.. it goes on. This is not a true gospel.
Amazon.com: Christianity In Crisis: The 21st Century (9780849900068): Hank Hanegraaff: Books