What religious curriculum? I know people who've spent their entire childhood in New Order Catholic schools who know little or nothing of the faith.
One such person had never heard of fasting on Fridays until I mentioned it. He told me he tried not eating meat on Good Friday once, but hadn't since being that he was a "meat and potatoes guy".
I know Catholics who spent their childhoods in pre-Vatican II Catholic schools who know nothing about the Faith, either.
All your assertion and mine prove is that Catholic adults have to reinforce their learning, or they forget it or act as if they never learned it.
The Catholic Church has never been any good at teaching adults. We teach kids and play with adults, when we should be playing with kids and teaching adults.