“So when Catholics say they profess the Nicene Creed we are to realize they really don’t?”
Your questions makes no sense. The Nicene Creed’s doctrines are all professed by Catholics.
Of course it does. You made the claim that the RCC say that Muslims only “profess” to serve the same God. Did you not mean by that that the RCC does not believe that they do? So it simply follows that you believe the simply “professing” something does not mean it’s true. Therefore, it follows that if Catholics “profess” the Nicene Creed it is not necessarily so.
As does the RCC claim that Muslims “profess” the same God as they do.
# 841 The Church’s relationship with the Muslims. “The plan of salvation also includes those who acknowledge the Creator, in the first place amongst whom are the Muslims; these profess to hold the faith of Abraham, and together with us they adore the one, merciful God, mankind’s judge on the last day.”[330]