Terry, I really have to laugh. You have once again demonstrated your ability to, at best, broadbrush, or at worst, another revelation of utter ignorance of Christianity, and what it teaches. For the sake of clarity, Pentecostalism, is accepted as a part of historical Christian orthodoxy. Examples of orthodox Pentecostal denominations would be Calvary Chapel, The Assemblies of God, The Foursquare Church, The Church of God, and The Church of God in Christ.
Though Oneness sprung from the Azusa Street movement, as did the other Pentecostal denominations, United Pentecostalism, i.e., Oneness Pentecostalism, is not accepted as a part of the historical Christian orthodoxy. The reason is that they are modalistic in their theology proper. In other words, they believe that God puts on three masks (Father, Son, or Holy Spirit) at differing times. Modalism has been labeled a heresy since about the 2nd century A.D.
Back to the original post, there have been a number of critiques of the prosperity gospel. Christianity in Crisis by Hank Hannegraf, Charismatic Chaos by John MacArthur (both are very extreme), and recently the 3rd edition of Let The Nations Be Glad by John Piper (a more calm and loving approach) are some of a number of books that have been very critical of the prosperity movement. I for one was part of a church that was, and still is teaching prosperity. I eventually left that church because of this and other issues. I even thought of writing a paper on this issue. I even interviewed a number of prosperity pastors for it. However, my professor persuaded me that this was not the best outlet for that paper.
In talking to these pastors, many of whom graduated from Oral Roberts Univerity, I found that they sincerely believed that God intends for Christians to take the "wealth of the wicked" which was stored for "the righteous." When I asked them about the human tendancy for greed, they all downplayed it and stated that if the finances are freely given to the church, then greed is not a problem. I also asked about Jesus' poverty, and they all to a man, denied this. When I pointed out that Jesus had to borrow a donkey for Palm Sunday, an upper room for the Last Supper, and a tomb for His burial, they downplayed it by saying that Jesus did that because He was not from Jerusalem, but from Gallilee. I guess Jesus and His step-father, Joseph, must have had a rip roaring carpentry business in that hick village of Nazareth.
The issue with the prosperity "gospel" is that it makes God the means for the ends, riches. This was something that Paul clearly stated was an improper use of the gospel (1 & 2 Timothy). The other thing that distresses me about the prosperity gospel, is that is preached to the lower economic strata, particularly in Africa, by preachers that come from North America, where the lifestyle of an average welfare recipient would be considered lavish by many Africans.
Lastly, this is not supererogation. It is a misuse of Jesus' teaching about money. Jesus stated that it would be easier for a literal camel to go through a literal needle's eye, than for a rich man to get into the kingdom of heaven. Jesus, never took a dim view of wealth, He after all needed money to pay for a Roman tax. However, he wanted his followers to know that their trust was not to be in wealth, but in God. This is why he said that where one's treasure is then his heart will be there also. What the prosperity teachers have done, in my opinion, is corrupt the gospel by making it a means, in stead of an ends.