Do Catholics just believe whatever new doctrines the Vatican spits out? I know I'm generalizing by saying "catholics," so I'll narrow it. What do catholics on here believe regarding this?

If I were Catholic I think I'd be critical of any new doctrines, considering the religion is CHRISTianity and Mr. Christ died 2000 years ago. They may be ordained and blessed and learned and all that other good stuff, but is anyone really an authority on this subject.

Which brings me to another, perhaps more valid question. What is the Church's stance on modern doctrines; do they require faith in them, or are catholics only required to believe in the older teachings?