Especially in the USA but also in German cities and all over the world, it is just a gigantic celebration without Christian thoughts. The Americans are not to be blamed for that. They don’t have the carnival celebrated in Germany and they have to put all their effort of dressing up and having fun into that one special night: Halloween.
The churchly effort is amusing, as they try to convert the thought of Halloween and its symbol, the pumpkin, into something that has to do with believe. Mostly they put a crucifix into the pumpkin or cut crucifixes out of pumpkins in order to destroy the non-Christian origins. But it doesn’t work.
The clue is TRICK OR TREAT!!