A couple of thoughts:
Just because you call a statement like that a creed, doesn't make it so. Or are you saying that to say "I believe the Bible" is equal to the creeds you mentioned?
DHK is correct, I don't study the creeds, but I do study history. Just because I don't care for the mindless reverence some of you display for the various creeds doesn't mean that I am unaware of the history that spawned them.
Of course, error and heresy gets repeated down through history. But I don't use the creeds to determine what is heretical. I use the Scripture. Now if that is a creed - and it's not - then I am fine with being creedal.
There are other ways of determining that these group are cults and heresies: the best method is through the Scripture.
You are acting as if accepting a particular creed is the antidote for all heresy. I would say that sound biblical teaching is the antidote to these false beliefs.
Friend......sound biblical teaching is what a good confession or creed is;
see if you can say this much biblicaltruth in less words,or with better verses
http://www.vor.org/truth/1689/1689bc00.html