They are protestants only in the broadest sense of that term. Indeed they are protesting your pope and defying the historic teaching of the Roman Catholics, but neither the UCC nor these nominal Catholics accept “Reformation principles of justification by faith alone,” which was the fulcrum on which the Reformation turned. I suspect they wouldn’t have the slightest undertanding of the historic Protestant understanding of justification. And it is that doctrine, more than any other, which unites Protestants.
by faith alone — there are Unitarians, Swedenborgians, even some Evangelicals (can’t remember which off hand, but some freepers belong to these and pointed it out) which refute that.