At one time, that was true. Today, however, sports has replaced Sunday worship. The parents make sure, though, that their children are baptized then return for First Communion. I have also heard "birthday party" as an excuse, as well.
Attending church does not qualify as being raised in the faith. That begins and continues throughout the week, at home.
Schools have something to do with it also. There is the closing of schools because of the cost factor. But also the children than go to Catholic high school or college seems to be missing Catholics. At least this is what I see among my children and grandchildren.
Yes, ‘raising’ must continue at home. But I’m not sure if that is a consideration in how the polling outfit defined as “raised.”