Continental Europe had, shall we say, a bad run with established state churches. The odd religious war or two, each lasting up to 80 years.
Hence the continental European idea of "separation of church and state" (transplanted to the USA, but interpreted in a novel way by SCOTUS over the past century or so).
As an example, of the continental European idea, Abraham Kuyper (a Calvinist theologian and pastor) became Prime Minister of the Netherlands in 1901. But he was in coalition with a Catholic party, so his idea was to run the country on Christian lines, but not to favour Catholics, nor to favour the Protestant church he helped found, nor to favour the Protestant church he split from (which had been a state church up until 1795).