In the fourth one he is talking to a woman, and you can barely hear her.
It doesn't sound like Brother Stair to me, the man's voice sounds younger.
I listened to the first and fifth clips; it sounds like somebody is trying to parody numbers stations and radio preachers. If you listen closely, the man is trying to over-enunciate the beginnings of his sentences, almost like he is a non-actor in a bad stage play. Notice the first song is "Christmastime is Here" from the Peanuts Christmas special; maybe it's some sort of weird parody of that?
I stand confused.