It seems people forget how long Protestantism has been around.
It came over 1500 years after both Christ ascended and the Church was born.
Now, how long has Protestantism been around again?
Irrelevant question. More important questions would be "What were they protesting"? Ans: Corrupt practices of the RCC.
"Were Jesus and the Apostles Catholic"? Ans: No, they were practicing Jews. (Which has been around much longer than Catholicism).