since when are Scots people anti-Christian?

Since the last 12 years.

http://www.heraldscotland.com/comment/columnists/challenge-to-the-kirk-as-number-of-scots-without-a-religion-at-new-high.2226316

http://www.scotsman.com/news/catholic-church-moves-into-pole-position-1-1433537

The only kind of Christian church attendance that's been on the up in Scotland over the last decade has been mass-going in Polish. (And a very small number of African immigrants involved in freaky fundie cults, but their numbers are too low to feature in the census).

There is simply no market for Christian music in Scotland, as there is in North America. In the 40 years I've lived here I've never seen even one Christian music act publicly advertised, and mainstream record shops have never had bins for it.