a predominantly Protestant country

According to the CIA World Factbook (2006, link), the religious breakdown for the Netherlands is:

Roman Catholic 30%
Dutch Reformed 11%
Calvinist 6%
other Protestant 3%
Muslim 5.8%
other 2.2%
none 42%

So, it looks like the atheists have the majority, followed by Roman Catholics, and then Protestants.

Ceci n'est pas un seing.