Those who teach and practice such on television or anywhere else, may be completely sincere, and those who are deceived by such teaching and practice may be absolutely sincere. However, this does not mean they are right. And Faith One's feelings come as a result of what he believes. If he believes truth which generates feelings in his heart, his feelings are not proof that he has believed truth. Truth is not truth because people believe it.
Truth is truth because it is true, or because it is so.
And it is true, or it is so, whether anyone believes it, or does not believe it. If one believes error thinking it is true, his feelings will be just the same as if what he believed were really true. However, this publican was a child of God under the old covenant, or law of Moses. Therefore, the case of this publican is not an example of how one became a Christian, and how Jesus comes into the heart of one who is not a child of God, or not a Christian. What Ananias told Saul of Tarsus to do shows us clearly how one can call on the name of the Lord.