Protestantism did not exist for all those centuries, but Christianity did. As the centuries passed, the pagan and secular aspects of Roman Catholic beliefs, policies, and traditions became unendurable to people like Martin Luther.Basically Protestantism didn't exists for over 1500 year after Jesus how can they believe it is the true Christian faith when there is no archeological or historical evidence for their belief system
Thanks
Therefore, the Protestant Reformation came to happen. It may not have been so ugly and wrenching if the Catholic hierarchy hadn't been so worldly and entrenched politically.
Tom