“What does Scripture say?”
Most Christians didn’t have access to the Scriptures until after the invention of the printing press a few centuries ago. There have been and still are many people who can’t read. Even if they don’t belong to the Catholic Church, they follow the guidance of their church.
Speaking to your point regarding illiteracy even Catholic illiteracy...you may have a point. There-fore all illiterate Catholics should at least get into a Southern Baptist Sunday School even if they still want to get to Mass. Take the first thru 5th grade classes...bible memorization of key verses and stories are highly stressed and they’ll get more unfettered Bible info there then in any Catechism classes which do require a high degree of literacy!
You have done a great FREEPER service by pointing out how vulnerable illiterate folks are to the manipulations of Churches who don’t have the full Gospel in mind and heart and in the process make their illiterate parishioners thrice damned more then the priests of these benighted sheep themselves!
It was for that reason that Bibles were printed in the vernacular tongues and were used as early reading primers for children....especially in the settler/pioneer days of early North America!
The illiterate are easily hoodwinked and controlled which is why social psychopaths in the leadership of the governments and mainline liberal churches work real hard to keep them that way.