:: priesthood of all believers, cardinal doctrinal principle of the churches of the 16th-century Reformation, both Lutheran and Reformed ::
Fail.
Grace alone.
Faith alone.
Scripture alone.
The Reformers did not cite TPOAB as a doctrinal free-for-all.
The Post-modern Western “churchiness” cult did this in order to justify destroying the God-given (Leviticus) Liturgical life of God’s people.
These heterodox, too, espouse Gnostic teachings such as “thus do not need a priestly mediator”.
Beyond that I am not going to try involve the Q thread in the Rift between the Eastern and Western Church or the Protestant reformation.