I said this to a JW who is still friendly despite my "leaving the truth":
"If I went out into my street with a baseball bat and killed two people with it, would I be guilty of murder?"
The JW immediately said, "Yes, of course."
Then I said, "OK, but what if they were both religious terrorists who had swords and were trying to decapitate a neighbor's head?"
They then agreed with me that the authorities would find me innocent - due to my motives!
Whatever a person's motives are for celebrating Christmas or using pagan names for days/months of the year, or wearing a necktie, or enjoying all the aspects of a wedding which include a ceremony, white dress, veil, cake, etc., (all of which have pagan connections) it's entirely personal, and down to them.