There's a lot of things about Christmas and Easter (even Thanksgiving) that are 100% pagan in origin, no doubt about it.
THAT SAID early Christians would invert the meanings of these pagan festivals as a form of protest so in my opinion there's nothing wrong with celebrating holidays like Christmas and Easter because the meaning has completely shifted from the old days.
Ironically, a lot of people who claim Christians have turned pagan are Jews, who plaster the star of Remphan (Ba'al/Wotan) on everything.
But yeah Halloween is for snake handlers and occultists.