The “Reformation” (as it is usually referred to) was indeed a “Revolution” or “Revolt” insofar as it departed from passed-down Christian Tradition. The early church did not resemble Protestantism all that much, yet Protestantism claimed to be restoring it, or hearkening back to that earlier “golden era”: the literal meaning of “Reformation”. One can’t re-form something that never existed in any form (as we Catholics would argue). The Catholic has every bit as much rationale to call what happened