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>> “how do we decide the truth of what Christmas taught?”
“Christmas” is not mentioned in the word of God.
The pagan practices of December 25 are discussed by some of the prophets. It is the day that the new born babies were sacrificed in the arms of the idol in the fire.
As far as I can see, truth is abhorrent in “catholic” teachings. People were slaughtered for clinging to Biblical truth, by the catholic church.
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I assume you realize spelllcheck will sneak in after you have long left typing. So sorry, but glad you found something to act self righteous about