If we're talking about social ties, you should probably be looking at the number of people who attend church weekly. I don't think there's a big social ties difference between going to church twice a year and not going at all, and it looks like your link only goes back to the '90s for 'goes to religious observance nearly every week' and 'has been in the last seven days'

For that matter, I know a handful of people (my grandparents age) who aren't really religious but that go to church most weeks 'cause it's a nice social thing.