Modernism. Syncretism. Indifferentism. New Age. Novelty. Read about how the Faith has been and is being subverted at The Old Evangelization blog. For starters, there's this short article on modernism:
Subvert The Catholic Faith With This One Weird Worldview
Lots of good info packed in a short article, including a link to Pope St. Pius X's encyclical on Modernism's doctrines. From the article:
"Because modernists love novelty, being dissatisfied with the Church as it is, they try to reform her in a host of areas. Philosophy, theology, history, worship, morals - no area of the Church's life evades their attempts at reform."
Sadly familiar, no?