Well, I am from Slovakia. I was never met with open criticism or any kind of aggression towards me for not being christian. I think majority of Europeans are only Sunday Christians.

The level of engagement I have seen in US is far beyond this.

Parts of the UK (e.g. Northern Scotland, Western Isles) could be pretty strict about some things - particularly observing the Sabbath. Even though my parents were "heathens" we didn't hang up washing outside on a Sunday or go out on bicycles - for fear of upsetting the neighbours.

If you've seen Lars von Trier's excellent Breaking the Waves you will get the idea.

[NB I don't think things are nearly as strict as they used to be.]