poshme we do not celebrate Halloween as a family. So I totally get where you are coming from.
As a Christian I don't feel comfortable glorifying 'evil' things. By this I mean dressing up as the devil, as vampires, zombie's or murders etc!
When DD was smaller it was totally easy to avoid it all and just not join in. As she got older that was harder and I did not want her to miss out on fun so I encourage our church to do a Light party every year. This means my taking the lead in organising it. At a light party the kids dress up in a non-scary way, they play games and have fun, eat nice food and sweets and get a party bag. There might also be drama and singing etc.
While shops, resraurants and pubs are making money selling 'Halloween' type stuff we are running a local community party for free. I can't really see why people would object to Christians not celebrating Halloween!
We carve pumpkins with smiley faces.
We do not go trick or treating, although this year we are going treat and treating, where we take sweets to friends and see if they will give us some too (I have pre-arranged for a few friends locally who I think will be in). I offered to do this last year but DD was not actually that bothered! The idea of kids knocking at random houses is not nice, or (I think) especially safe and is probably scary for elderly people.
In the past I got in healthy snacks and Christian book marks to give to trick or treaters, I am happy if they are little kids dressed up but I don't want older kids on my doorstep moaning if the sweets I give are not good enough! So now each year we download a poster from the police that says No Trick or Treat. I know Thames Valley do one. It just says something like 'enjoy your evening but don't disturb mine.'
At Christmas I got carol singing with my church, if someone had a sign up saying 'enjoy your evening but don't disturb mine.' I would respect their wishes and not sing on their doorstep!