Besalel,
I will repeat again, the concept is nothing less than the following Shu”A (Note – the Beis Yosef lived in Tzefat EY)
“אֵין יוֹם הֶחָג אָסוּר אֶלָּא לָעוֹבְדִים בּוֹ בִּלְבַד, אֲבָל הָעוֹבְדֵי כּוֹכָבִים שֶׁשְּׂמֵחִים בּוֹ וְאוֹכְלִים וְשׁוֹתִים וּמְשַׁמְּרִים אוֹתוֹ מִפְּנֵי מִנְהָג”
There is a saying that “too much information leads to misinformation”!
You are getting carried away and with all the Wiki info confusion. As far as Halacha is concerned, you need to know why and where the ones in concern are celebrating. Ask the random Joe Doe down your block and he will tell you, he has no idea what you are quoting, he is not even religious nor did he ever hear or believe of any of these copy/paste Wiki info you and Joseph keep on repeating. Ghosts, devils, spirits are just kids tales to the typical american.
Now Joseph will go and say x-mas is the same. No its not the same – the typical Joe definitely associates it with Christ….