There is nothing Satanic about the joy in some 2 year olds face as you put candy in his or her bag. The holiday was originally about honoring our deceased ancestors and it still in in Mexico (Dia Del Los Muertos is the day after Halloween). At some point it became about being scary and giving candy to kids. I'm not sure how that happened but it is not a Satanic holiday.
Halloween is just a day for kids to dress up and get lots of candy so they can start having tooth decay and obesity problems at a young age.