Did someone every tell you that Halloween was the devil's holiday? turns out they didn't do their research, Halloween also isn't the pagen holiday Samein. They are two very different celebrations. Everything we do on Halloween including trick-or-treating, wearing costumes, and lighting the jack-o-lanterns have roots in a Christian Celebration that took place on the 31st of October in preperation for All souls day on November 1st. crazy right?