How scary is Hallowe'en?
As scary as costume-makers, party-givers, and commercial interests want to make it. The morning after the costumes get packed away, the residues of the parties get mopped up, and the markets get ready for Christmas and Valentine's Day sales. It's hard to picture many children being traumatized or adults converted, or deconverted, by the evening's doings. It is not scary at all to those who do not don costumes, go to parties, or buy black and orange objects. It's hard to picture many of them being much different than they were before the occasion.

Is it anti-Christian?
Is it anti-Jewish?
Is it pro-pagan?

If I wanted to undercut or oppose Christianity or Judaism, I could find many better investments than putting energy into the mix of pseudo-symbols associated with Hallowe'en. Pseudo? Not many of the symbols rise out of the historic evidences of the classic faiths; these tend to be cartoon caricatures, far removed from the beliefs and practices of the Christian middle ages, and unrecognizable by anyone who knows much about classical witchcraft. And if I were a pagan, a witch, a promoter of Wicca, I'd look for more serious ways to present the cases.

When Christians and Jews over-react to phenomena like this, they show more about their outlook--prissy, aggrieved, defensive--than about actual challenges to faith. My advice to co-religionists: when someone says "boo!", say "boo!" back, and go about your business. That responsive "boo!" could mean: "see you tomorrow, November 1"--and if it's a Christian with whom the "boo!-boo!" exchange is going on, remind the other partner to the conversation that November 1 is All Saints' Day, a day which for Christians is a serious holiday of remembrance.