Protestantism copied/copies a lot of the non-Biblical tradition propagated by Catholicism (e.g., Sunday replacing the Sabbath, recognition of non-Biblical holy days, claiming "Jesus nailed the law to the cross" when the exact opposite is stated in the Bible, etc).
That's neither here nor there when the entire point was to eschew non-Biblical tradition maintained by the Church. Notwithstanding that there are various Protestant sects and some do not practice what you're accusing them of. It's a large tent, the beliefs aren't that specific.
