Hey guys! This article is grossly focused on government numbers for the amount of Christians in different nations!!
For example, I'm half-Norwegian and half-Cantonese and I've gotta say... there are between 5-10% Christians in China and it's definitely not around 90% in Norway just because there are that many members in the State church. Will the number of Christians in Norway really fall by about 80% if the State Church is disbanded? Most of them wouldn't even care! It doesn't work that way. The number of Christians in a country are personal adherants to Jesus not whatever the State has got on paper. This isn't Islam where you're automatically a muslim at birth when someone orates the passage of faith to your ears as an infant in the crib (thus btw. making you eligible for persecution if you convert away from Islam), this is a volountary faith!
As a Norwegian I can witness personally that the number of Christians is definitely below 50% and China will probably pass the magical 10% marker in a decade or two.