Some personal hypothesis based on some data and some experience:
1) The colonies were the designated “nutter dumps” of the UK. The Mayflower people were not the only group of nutters that was kindly suggested to GTFO over the years.
2) Continental Europe has already went through the kind of religious fanatism that the US is experiencing, only much worse.
3) With the fact that many countries in Europe are mostly catholic or have state sponsored churches of some other denomination, ministers don’t need to convert people to put food on their tables.
4) Europeans see religion as largely meaningless because it has become a habit, due to the relative lack of interest after the end of the cold war.
While the US was very muich against communist ideals and took every occasion to distance itself from them, thus becoming hyperreligious to counter the atheism that soviet russia enforced, Europe was very much struggling between the two positions, even getting so far as dividing families over the issue.
I’m going to give you some examples from my native Italy: During the cold war, we had a communist party AND a christian party AND a right-wing party AND a socialist party. And these were only the major ones.
Large cities had huge problems with groups of, perhaps too idealistic, youths beating eachother up very badly, even murdering eachother and, while some fringes disagreed, most people thought that had to stop, regardless of the ideology they adhered to.
Eventually, even during the cold war, the whole religion/atheism debate calmed down. Some people were atheists, the church disapproved, and they didn’t care, and that was about it.
They did not dare say more than that they disapproved because the communists would have been all over that, immediately lumping the church in with the fascists and giving cause for huge problems. Like the kidnapping of Aldo Moro.
Then the cold war died off and without the ideologies to motivate either position people were basically clinging to one position or the other because of habit.
I, for instance, have my mother, who teaches in catechism and used to be a member of “Comunione e liberazione” (christian party), and then left when they started to lean more to the right, my father who went to a gesuit school and is a very peculiar and unique to him brand of christian (I call it the “i’m right, STFU” brand), my grandma whose ideas on scriptural interpretation would have gotten her burned to the stake not half a century ago.
And then there’s me, atheist to the bone and currently in a relationship with another atheist born of a fundamentalist catholic family’s black sheep branch.
I guess it’s mostly that people here have more sense than to disown people for differences of opinion because those who did in the last 50 years don’t have a legacy anymore.