Your version of the 8th would literally undo all religion
It would undo the myths, I think. Morality and religious practices might survive depending on how much they rely on said myths.
and a bit of science
It would perhaps demote a lot of theories back to hypotheses, but that's actually good IMO. A good scientist should embrace the doubt and treat it as a respectable enemy, not hide from it like a catfish in the mud.
Persuasion itself goes from neutral to negative, depending on your moral standards. (They're partially individual, partially cultural.) Because at the end of the day it boils down to "I want you to believe in this, because I benefit from your belief."
And you definitively see some backslash against this aspect of advertisement; same deal with personal communication, a person being excessively rhetoric for their own benefit is immediately labelled distrustful.
Then over that propaganda adds further layers of nastiness, like: