"Dogmatic purity?"
Presbyterians don't believe they are the "only" true church on earth.
The RCC believes it is the only "true" church on earth.
Presbyterians don't believe their church (or any church) is without error.
The RCC believes its magisterium is without error.
Presbyterians don't believe their pastors are "infallible."
The RCC believes its papacy is "infallible" in matters of religion.
Presbyterians know there is only one Savior, Jesus Christ, our only mediator.
The RCC believes its priestcraft all to be "another Christ."
Repent.
Breath.
Find a happy place.
Why on earth would you subscribe to a faith unless you believed it were the right one?
Your position is absolutely illogical from every standpoint.
If there is no single entity without error, whither the Holy Spirit?
You don’t even know the definition of “mediator”.
Everything that stems from that argument is made lame at the starting gate.
You refer to “priestcraft” as if with the implication that it’s tantamount to “witchcraft”. I take grave offense at that calumny, and I’ve had it up to here with this disgusting bigotry.