Western Civilization It's always funny when people think to tell me about Dutch history as if I'm ignorant of the history of my own country. You're confusing states with nation states, which came a lot later than the Westphalian system.
Dutch tolerance is in fact a fairy tale that was romanticised thanks to the links to the pilgrim fathers and the dominance that the Netherlands got in the 17th century when the system of religious tolerance continued. But it was tolerant to the point that different people could live next to each other but it didn't accept exchange between the two to the point that they had their own church, schools, bakery, hairdresser etc. that was largely also a reflection of regional differences. Even in that period of "tolerance" (starting in 1543 with the 17 provinces) the Great Iconoclasm happened. It was pragmatism that brought them back together. Certainly, nothing as high minded as liberalism crossed these men's minds. In reality, this religious tolerance existed in other European countries as well at the time. Meanwhile all those Jews that were welcome were still pushed into ghettos and they had to bury their dead far away from the cities.
The pilgrim fathers moved to a country that was receptive of protestants (
calvinisten) and the Dutch had just signed a treaty with the Spanish - it was close and relatively safe at a time that local rulers were quick to (pretend to) be calvinist or at least 'tolerant' to the point they kept their heads and power. The pilgrims still got into religious fights in Amsterdam after which they moved to Leiden, where they then were disgusted with the drinking and gambling going on.
Even so, all this, including the first colonies, predates liberalism as a political movement and any links to Dutch thinkers is tenuous at best.