People choose to do what they want, based on what their priorities are. Whether or not people call themselves Christians, Jesus said you know them by the fruits. Here is a summary to think about:
What is the Origin of Halloween?
Though celebrated as a Christian holiday, Halloween finds its origins in pre-Christian festivals that propagate false ideas about life after death. Interestingly, we read: “After the Reformation, Protestants rejected this feast along with other important ones such as Christmas and Easter. Nevertheless, Halloween folk customs of pagan origin flourished.”?—Encyclopædia Britannica (1959), Volume 11, page 107.
All Saints’ Day: “There is little doubt that the Christian church sought to eliminate or supplant the Druid festival of the dead by introducing the alternative observance of All Saints’ day on Nov. 1. This feast was established to honour all saints, known or unknown, but it failed to displace the pagan celebration of Samhain.”?—Encyclopædia Britannica (1959), Volume 11, page 107.
The 1910 edition of The Encyclopædia Britannica states: “All Souls’ Day . . . the day set apart in the Roman Catholic Church for the commemoration of the faithful departed. The celebration is based on the doctrine that the souls of the faithful which at death have not been cleansed from venial sins, or have not atoned for past transgressions, cannot attain the Beatific Vision, and that they may be helped to do so by prayer and by the sacrifice of the mass. . . . Certain popular beliefs connected with All Souls’ Day are of pagan origin and immemorial antiquity. Thus the dead are believed by the peasantry of many Catholic countries to return to their former homes on All Souls’ night and partake of the food of the living.”—Vol. I, p. 709.
The Encyclopedia Americana says: “Elements of the customs connected with Halloween can be traced to a Druid ceremony in pre-Christian times. The Celts had festivals for two major gods—a sun god and a god of the dead (called Samhain), whose festival was held on November 1, the beginning of the Celtic New Year. The festival of the dead was gradually incorporated into Christian ritual.”—(1977), Vol. 13, p. 725.
The book The Worship of the Dead points to this origin: “The mythologies of all the ancient nations are interwoven with the events of the Deluge . . . The force of this argument is illustrated by the fact of the observance of a great festival of the dead in commemoration of the event, not only by nations more or less in communication with each other, but by others widely separated, both by the ocean and by centuries of time. This festival is, moreover, held by all on or about the very day on which, according to the Mosaic account, the Deluge took place, viz., the seventeenth day of the second month—the month nearly corresponding with our November.” (London, 1904, Colonel J. Garnier, p. 4)
Thus these celebrations actually began with an honoring of people whom God had destroyed because of their badness in Noah’s day.—Gen. 6:5-7; 7:11.
Thousands of Wiccans, who follow ancient Celtic rituals, still call Halloween by the ancient name Samhain and consider it to be the most sacred night of the year. “Christians ‘don’t realize it, but they’re celebrating our holiday with us. . . . We like it,’” stated the newspaper USA Today when quoting a professed witch.
Is doing so acceptable to God?
The Bible warns: “There must never be anyone among you who . . . consults ghosts or spirits, or calls up the dead.” (Deuteronomy 18:10-12, The Jerusalem Bible) While some view Halloween as harmless fun, the Bible indicates that the practices associated with it are not.
At 1 Corinthians 10:20, 21, the Bible says: “I do not want you to be participants with demons. You cannot drink the cup of the Lord and the cup of demons too.”—New International Version.
Such holidays honoring “spirits of the dead” as if they were alive in another realm are contrary to the Bible’s description of death as a state of complete unconsciousness:
5 For the living know that they will die, but the dead know nothing at all, nor do they have any more reward, because all memory of them is forgotten.
10 Whatever your hand finds to do, do with all your might, for there is no work nor planning nor knowledge nor wisdom in the Grave, where you are going.
Psalm 146:3, 4
3 Do not put your trust in princes
Nor in a son of man, who cannot bring salvation.
4 His spirit goes out, he returns to the ground;
On that very day his thoughts perish.
Jesus Christ, the Son of God, pointed to the future resurrection of the dead for those who practice good things and those who practice vile things --
John 5:28, 29
28 Do not be amazed at this, for the hour is coming in which all those in the memorial tombs will hear his voice 29 and come out, those who did good things to a resurrection of life, and those who practiced vile things to a resurrection of judgment.
Eph. 5:10, 11: “Keep on making sure of what is acceptable to the Lord; and quit sharing with them in the unfruitful works that belong to the darkness, but, rather, even be reproving them.”