I tried to defend implicit faith in another thread.
I think that it's definitely an error to say that a man can be saved in the practice of any religion except the Catholic religion. If implicit faith is a viable theological opinion, then the person must be an implicit Catholic, and practice all the absolutely necessary precepts of the Catholic religion. I also believe that anyone who explicitly denies a Catholic teaching cannot be a Catholic implicitly, i.e. if a Muslim explicitly denies that Christ is divine, then he cannot possibly be Catholic, because he openly denies the Catholic faith.
It's absolutely false to say that a Muslim can be saved by being a good Muslim, or a Jєω by being a good Jєω, or a Hindu by being a good Hindu, or an atheist by being a good atheist. In order for a "Muslim" to be saved, he would have to be a good Catholic, which is to say that he would not be a formal member of Islam at all, but only a material one.
It is ABSOLUTELY false to say that all the world's religions are different ways of "experiencing" God; that all the religions worship the same God but in different ways. Go read Pascendi again. This is THE principle of Modernism. Modernism starts by rejecting the notion that religion and revelation are received from God, from heaven; then it says that religion comes from a "religious impulse" or "sentiment" in man, that causes him to search for God or the Absolute or the Transcendent, or whatever, so all religions are different expressions of this religious desire immanent in man. THIS is Modernism, and it is everywhere. We must confess that the Catholic religion has been instituted by God, that it's doctrines are revealed by God, and that whatever superficial resemblances other religions might have to the true religion, they are impostors and the works of false shepherds. There is one true shepherd, Jesus Christ; and one true sheepfold, the Catholic Church.
Even though I am unsure about implicit faith and will tentatively defend it, I do agree that this "salvation in any religion" / denial of EENS is at the core of all the rot in the Church. Fr. Feeney was definitely right about that.
This idea that religion comes from within man, that its a process of "self-discovery", of man's discovering the divine or the transcendent with himself, etc. It leads to a kind of pantheism and self-deification of man. It is similar to ancient Gnosticism in some ways. It is deeply Satanic. In the satanic modern religion, God has been cast as a tyrant who only wants to limit man's freedom and punish man. Man, however, has been freed to discover and deify himself, find his purpose in life within himself. This is exactly what the Gnostics did. They said that the Creator of the world was evil, and that the serpent in the garden of Eden was man's liberator, because he taught us knowledge and how to become gods. Satan is using the same trick again and again. It's the same as in the garden of Eden. His strategy is to make man hate God and God's Law, and to make man a lawless worshiper of himself.