As a new member of this forum I have followed this thread with great interest. I joined the forum because I wanted to know more about the beliefs of my Catholic brothers and sisters (not thinking about converting: a life long Methodist here

)
And since this section is entitled “Non-Catholic Religions”, my assumption is that it is for Catholics who want to know more about “Non-Catholic Religions.” And I further assume it is for us “Non-Catholics” to answer your questions, since I further assume most of the forum members are Catholic. So when we answer questions we are doing what we are asked, not trying to berate or convert you, and I assume vice-versa, in light of the moderator’s non-proselytizing message.
One other caveat. I could/should never try to speak for “all or even most Protestants.” I have no such authority, no such knowledge, not all Protestants have the same views, and (a very regretful effect of the Reformation) there are more splintered denominations than can be counted. With that disclaimer -----
Most Protestants accept the Nicene Creed, which is what this thread originally asked about. Even “non-creedal” churches (“We have no creed but the Bible”) agree that the contents of the Creed are consistent with the Bible. In fact, the Methodist Church has never “officially” adopted the Nicene Creed (although it is printed in its hymnal). It has adopted Articles of Faith which, in the opinion of most, are entirely consistent with and reflect the Nicene Creed. Therefore, at least in my opinion, the Nicene Creed is the test – the standard – for orthodox Christianity.
[there are churches like the Mormons and Jehovah’s Witnesses which do not accept the Nicene Creed. In the opinion of most/many Protestants they are not Protestant and, probably, not Christian; correction, let me say more tolerantly “not orthodox Christian”.]
So the Creed is not the problem; it is accepted, and yes I know it was written by the holy catholic church (you know we don’t capitalize catholic in “our” printed creed.

) The “problem” as accurately described by
Juliebug108 from a Protestant perspective and by
Randy Carson from a Catholic perspective is the “extra” Catholic doctrines NOT in the Nicene Creed (and not in the Bible, in our view).
And, in my opinion, the real fundamental difference is
Sola Scriptura. Protestants do not accept as the inspired word of God anything not in the Old and New Testaments. Catholics, as I understand it, treat subsequent revelations of additional truths “by the Church” through the power of the Holy Spirit (not getting into whether it has to be a council, which council, a pope speaking officially, whatever) as inspired revelations of God equivalent to the Bible. Hence, the difference in beliefs.
PS. The existence of the “extra” inspired word of God to Joseph Smith is one of the major problems Protestants have with the Mormons, wonderful people though they are.
I hope this in some way answers your question; not to convince you, but to inform.
Since this is the day after Easter, I affirm the faith of the holy catholic church for 2000 years:
He is risen indeed.