The styles you describe are those prevalent in the Southern part of the country. That part of the country also produces the greatest number of ‘Born-againers,’ who are also the people who watch these shows. I suspect that the folks broadcasting these shows are not actually trying to convert anyone. What they are doing is raising funds to perpetuate the TV show, with money left over to pay the evangelist. Ergo, you are probably not the target audience in the first place.