I agree with this.
In fact, I think that Hallowe’en derives from pre-catholic celtic beliefs.
Depending on your point of view, guy fawkes is an even more foreign import. At least haloween ties in with Nos Calan Gaeaf which is something that was widely celebrated/observed in Wales up until a hundred or so tears back.
https://en.m.wikipedia.org/wiki/Calan_Gaeaf
I’m not mad about trick or treating, but I like the idea of Haloween. It also breaks up the long, dark winter into more digestible chunks of time. 6/7 weeks and I’ll be looking forward to Christmas type stuff and new year ( which is also an appropriated pagan celebration I think).