I'm not a Baptist or a Pentecostal so I haven't ever been to the Revival type meetings portrayed in the show, let alone in the era depicted in the show. But I have been to some Catholic charismatic prayer meetings. I do understand how people can be inspired and have a religious experience, even if I didn't experience that particular type of religious experience (too introverted or something I guess). I doubt the director or actor had any religious leanings at all, so the preacher just comes across as a screaming maniac. I understand Olivia's feelings. My mother must have felt the same way, seeing most of her children become agnostics.