(Part two of two)  Vatican II somehow gets involved, after another five hundred years.  All Vatican II does is invite the Faithful to think, rather than simply pay-pray-and-obey.

Nicaea and its Creed are more than hypothetical; they are the fundamental belief of Christians.  

we can ossify in our stodgy theological dungeons, but not all theology is in stogy theological dungeons, despite the likes of what caused the American Association of University Professors to censure the administration of The Catholic University of America.