It is interesting that Origen has selected these three for examination—
John Piper: a Calvinist who therefore believes in a limited atonement for a limited number of people, who were chosen by God for heaven before their birth.
Andrew Wommack: an Arminianist who therefore believes a genuine Christian can indeed lose his salvation through poor performance.
Joseph Prince: who is neither a Calvinist nor an Arminianist; that is, whereas like an Arminianist he believes in unlimited atonement for all, yet like a Calvinist he also thinks that a genuine Christian cannot possibly lose his salvation.
All three men believe in “the Baptism in the Holy Spirit” as an experience distinct from the initial salvation experience (that is, they are “charismatics”); and implicit to that, that the Gifts of the Holy Spirit are still available and vital to believers today.
Again, while it is true he is not a universalist (yet), my preference is Prince, who teaches that grace IS the gospel. He vigorously insists that the gospel is the gift of righteousness without works. He confronts how that although Christians start out understanding righteousness by faith, they usually end up moving into a false gospel of righteousness by works. However, we are saved by unmerited favor (not works), and we are kept by unmerited favor (not works).
Finally, here is an interesting article by a universalist titled, The “Grace Teachers” Lead Us Toward A Global Understanding of Salvation.