Oslo is fairly light on churches luckily. Well, there are plenty of churches but they aren't much used.. (http://no.wikipedia.org/wiki/Liste_over_kirker_i_Oslo). About 72% of the population in Norway (http://no.wikipedia.org/wiki/Ateisme) answered they don't believe in a personal god..
But the west-coast, where the artist lives, is basically the Bible-belt of Norway. Some people even queued up overnight for a new translation of the bible a few years ago..