Firstly which "idolatry" do you rather have? Fr. Neuhaus said
For the ecclesial Christian, the act of faith in Christ and the act of faith in the Church are not two acts of faith but one. In an important sense, every Christian, even the most individualistic, is an ecclesial Christian, since no one knows the gospel except from the Church.
If Protestants (Lutherans/Reformed etc) idolize the Bible, then Fr. Neuhaus idolizes the RCC. This statement is significant, notice that he says that faith is an action and that faith in Christ is not enough, one must have faith in the Church and by Church he means RCC.
This is not what Fr. Neuhaus is saying at all. That quoted line comes not from his experience as a Catholic convert but as a cradle Lutheran long before his conversion. A few lines earlier he says "To be brought up a Lutheran, at least a Missouri Synod Lutheran, at least there and at least then, was to know oneself as an ecclesial Christian." He is not referring to his faith in Christ in the same way as his faith in the Church. When he says the latter, he means faith in Christ within or as a member of the Church. That is what he means by being an ecclesial Christian, i.e., a Christian in the Church, not one who worships the Church as deity.
Fr. Neuhaus is really stating something simple: one's faith in Christ brings one inside the Church. The Church is, after all, the household of God and the pillar and foundation of truth, and Christ is the truth. This might sound controversial, but it is so true that extra ecclesiam nulla salus: outside the Church, there is no salvation. Here I refer to the Church referred to in Scripture, the one bride of the Christ, the one body of Christ. A Protestant may be free to dither about a Catholic Church that is not the Roman Catholic Church, but I think it is perilous to suggest that there is no Church as such, that an individual relationship with Christ is all they need. The people of God is a people, not a loose group of strangers who individually have a relationship with Christ. In this sense of what the Church means, Fr. Neuhaus is absolutely correct: faith in Christ and having that faith within the context of being in the Church are not separate things. Christ makes of us a bride, a body, a flock, a household, a great nation of royal priests, a family of sons and daughters, co-heirs of the Kingdom. Christ makes of us a Church, his Church, which he took great pains to build on top of himself, the cornerstone, using the Apostles as pillars and foundation. When his Church is persecuted, he is persecuted. When his Church is unfaithful, he is wounded terribly. It must also be pointed out that, when all is said and done, at the Lord's triumph will be one bride of Christ, not several brides. It must also be pointed out that the Lutherans also proclaim their belief in the one, holy catholic and Apostolic Church in the Nicene Creed, a Church entered through one baptism for the forgiveness of sins.
The real issue Lito is raising is not that there is any contradiction between faith in Christ and faith within the Church, but that the Roman Catholic Church is not that Church. That's a different issue altogether.