The current crop of parents were not taught doctrines, but the priests think they were, somehow. They think there is no need to go over “that” again in homilies, but there is.
At least, in this year of Faith, we are focusing on saying the Apostles Creed every Sunday at Mass, and it has been emphasized that we should know it.
What’s the point in rehearsing a creed if you cannot teach from the scripture the details of the creed? Learning to memorize and repeat something does no good to anyone.