You Protestants are the ones who began dividing, splintering,fracturing and splitting away (on your own). There were "no denominations--until Luther, then Zwingli, then Hus and on and on---now in the 21st century Confrinting, Orville, 4GVN, justachristian1 and on and on (now over 42,000 contradicting denominations of confusion, chaos, and heresy.
Yes there were other denominations before the Reformation & Luther. There was the numerous Orthodox and the Waldensians, Nazarenes, Galatian, and several others Catholics like to pretend never existed.
Today the only way to find the true church or faith of Jesus is with God's word. Find the ones keeping God's law including the right Sabbath and you narrow it way down. And there goes the RC.