"...when they teach, their teaching is correct."  I'd like to think people will use their God-given intellects rather than offer blind obedience.  For hundreds of years, the Church "taught" that the Sun revolved around the Earth...and, oh yes, what about Limbo?  Do you really believe the Virgin was indeed a virgin, do you believe she didn't die and ascended into Heaven, etc?  Where does all this stuff come from?  Old celibate men, I would say.