I'm sure the expression "ignorance is bliss" didn't come to fruition by accident.
Catholics claimed to be faithful to Scripture, also. So there you go!
Yes and we don't go around changing Scripture whenever it suits an agenda.
There is ONE Bible which contains ALL TRUTH and ONE TEACHER, the Holy Spirit.
Where does the Bible say that it contains ALL truth?
Is your Bible complete (e.g. does it contain the seven Deuterocanonical books)?