He is a relatively progressive christian, not as much a "so-called conservative" christian as most of NA ones, but equally closed minded as most north america spiritual people sadly. I'm glad he was receptive of the heavy metal church because he would have been blatently hypocritical if he hadn't.
The musicians were acting like it was a typical performance for human paying fans and they were entertaining people, not singing praise and worship to a deity. That's why their body language was something he objected to; it detracts from the whole point of praise and worshipping a deity to diminish your voice like that etc
He seemed rather conservative to me. A creationist who believes in the Bible literally, and takes his religion seriously. How do you think the "typical conservative" would react to what was in the video?
I don't think that being firm about your stance or opinion always means you're "closed-minded". I think that a closed-minded person is one who refuses to even consider looking at things from another perspective, but an open-minded person might do so and still maintain his/her original stance, sometimes even more firmly. It's sorta like how I might understand why a criminal committed a crime, but that understanding doesn't equal justification.
Regarding heavy metal in church, he was talking from his perspective concerning churches, that they're places of worship, and that they should bring you closer to God by promoting concepts like humility, having a peaceful atmosphere, etc. The atmosphere there felt closer to that of a concert. Looking at it from his perspective didn't make much sense to me neither. He understands that the culture there accepts it, but he refuses to accept it, both based on what churches represent to each.