Augustus
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Catholics are not sola scriptura. They believe that the authority is the church, which includes the Bible but also includes things like ecumenical councils. You can ask them how they believe this works, which is via Apostolic Succession. They will be happy to explain.
The celebration of the Nativity certainly didn't come from paganism, which wasn't interested in Jesus birth. In the 3rd century, bishops began including a feast of the nativity, but different bishops did it on different days. In the 4th century, all the bishops agreed on a common day for it. It really had nothing to do with paganism.
Now, you seem to wish to make this thread into a Catholic bashing thread. I won't participate in that. As a Jew, I personally have a great many problems with Christian theology. But I tend to think well of Christians for whom their faith brings them closer to God and assists them in becoming better people -- it doesn't matter squat to me if they are Catholic, Protestant, or Orthodox.
I think you have misunderstood.
I was discussing what 17th C Protestants thought, not what I think