Protestantism naturally cultivates religious narcissism.
It teaches the individual that his private judgment can stand over every visible authority, every council, every bishop, and ultimately the historic Church herself.
If the Church contradicts him, the Church is wrong.
If tradition contradicts him, tradition is corrupt.
If Christians for centuries contradict him, they misunderstood Scripture.
If his denomination contradicts him, he can simply leave and find, or create, another one.
And yet he will still say, "I submit only to Christ."
In practice, this simply means, "I submit to my own interpretation of Christ, and no earthly authority may finally correct me."
Protestantism makes the individual the final court of appeal. And rather than abolishing religious authority, it relocates that authority into the ego of the individual. That is precisely why it so naturally cultivates religious narcissism.