On it's face, I don't see anything unbiblical about it. But it's not inspired literature and the problem with using it as the basis of faith, since it's not inspired, is that it can be interpreted however one likes.
You wrote: "...it can be interpreted however one likes."
Isn't that exactly how you Protestants treat the Bible? Get ten Protestants in a room, give them one verse and you'll get eleven interpretations!
Can infants be baptized?
Bible only Presbyterians say yes.
Bible only Lutherans say yes.
Bible only baptists say no.
Make up your mind! How you Protestants can say that the creed can be interpretated every which way and ignore the fact that you Protestants do that with inspired scripture every day is beyond me. Hypocrisy.