Implicit faith is not only a novelty it is heresy.
After describing the Most Holy Trinity, Pope Eugene IV at the Council of Florence infallibly says this: "Whoever, therefore, wishes to be saved, let him
think thus of the Trinity."
He is specifically stating that a person must know and believe correctly concerning the Trinity, and that anyone who does not is incapable of attaining salvation (as is more clearly seen in the rest of his decree; ie "This is the Catholic Faith.
Unless a person believes it faithfully and firmly, he cannot be saved.").
Arguing that "Feeneyism" is heresy has been tried, and it fails every time; it's an empty pursuit. Believing that one can be saved without the sacrament of baptism, on the other hand, is definitely heretical.
The only way anybody will come to this truth is by adopting the
correct rule of Faith.
In fact, I am certain that it is a mass exodus from this rule that has precipitated the crisis facing the Church today.