[St_Thomas_Aquinas]

I always chuckle when a Catholic who views scripture as secondary to the magesterium claim Protestants who view scripture as their only source don’t know scripture.

What authority to Protestants recognize outside of Scripture? Luther?

Protestants believe many things. Not all Protestants adhere even to Luther's doctrine of Sola Scriptura, i.e, The Church of England.

Not all Protestants even adhere to the doctrine of the Trinity, i.e., Oneness Pentecostals.

What single doctrine do they ALL adhere to?

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They reject the authority of the Catholic Church.

This is a very serious thing, since St. Paul calls the church, "the pillar and foundation of truth," and Jesus said, "if he will not listen to the church, treat him as a pagan or tax collector."

[CynicalBear]

I don’t much pay attention to what “all the Protestants” do or believe other than to identify inconsistencies with scripture. Most of the Protestant churches are simply daughters of the RCC and have retained many of her errors.<<

>> They reject the authority of the Catholic Church.<<

LOL First and foremost the RCC has so polluted the meaning of the Greek word “ecclesia” that it’s virtually unrecognizable. It’s a tactic straight from Satan to obscure the true meaning. The pagan origins of most of the Catholic beliefs is pervasive in much of “religion” because of it.

>> This is a very serious thing, since St. Paul calls the church, "the pillar and foundation of truth," and Jesus said, "if he will not listen to the church, treat him as a pagan or tax collector."<<

Catholics fail to grasp the meaning of “pillar and foundation”. Pillars and foundations don’t determine the structure of a building. Nor does the Catholic Church uphold what was originally taught by the apostles but have polluted it and added to it. Most all of what they have changed and added has it’s roots in paganism.

[redleghunter]

And the pillar is based on what foundation? Of course the scriptures.