In the case of Catholicism in particular, this is a feature and not a bug. Catholics famously and proudly don't read the bible, but rather have its presumptive contents preached at them — with various degrees of translation, omission, or addition to suit the current whims of the Church — by their deacon.

A significant portion of what people assume to be modern Christian belief among multiple sects and denominations is not supported scripturally, to put it mildly. But the Catholics manage to institutionalize that phenomenon to a degree that makes all the others look like a monthly book club.