Irreligion in Norway

Norway is a comparatively secular nation which no longer has a state religion, though 68.7% of the 5.4 million population belong to the Church of Norway.
A partial explanation for the high membership is that by law all children who have at least one parent who is a member, automatically become members. This has been controversial, as many become members without knowing, and as this favours the Church of Norway over other churches, religions, lifestance organisations and over the unaffiliated. This law remained unchanged even after the separation of church and state in 2012.
A plurality of Norwegians do not believe in a god. A 2016 survey asking 4,000 people "Do you believe in God?" resulted in 39% saying "No", 37% saying "Yes" and 23% saying "I don't know".
There are several irreligious organisations in Norway. By far the biggest, oldest and most visible is the Norwegian Humanist Association (HEF), which has close to 100.000 members. Those members constitute 1.7% of the national population of 5.36 million, making the HEF by far the largest such association in the world in proportion to population.