Where did you get that idea? The Nicene Creed is the very structure upon which the Catechism of the Catholic Church is built.
Either the Catholic Church acknoledges that there are protestant churches that are part of the catholic and Aplostolic Church, or the Catholic Church does not acknowledge the validity of the Nicene Creed. Pretty simple.
The Nicene Council was Sola Scriptura. They stated that the Nicene Creed must be in agreement with Scripture. How can the Roman Catholic Church believe that the phrase "one holy catholic and Apostolic Church" refers to itself when this belief is not Scriptural? The one holy catholic and Apostolic Church is the group of all believers. That's Scriptural. But again, we'll disagree. And besides you haven't answered one of my Scriptural objections to the Catholic Church's authoritarian claims.