Before we tackle the origin of Halloween and its possible relationship with the flood, we need to ask an important question. WHY did God allow the entire earth to fill with water such that roughly one BILLION people drowned? The Bible tells us exactly why the deluge came upon the earth.
5 The LORD observed the extent of human wickedness on the earth, and he saw that everything they thought or imagined was consistently and totally evil. 6 So the LORD was sorry he had ever made them and put them on the earth. It broke his heart (Genesis 6:5-7, NLT throughout)
Since the time of Adam, humans grew progressively worse in their disobedience to God. At the time of the deluge, about 1,600 years after the creation of Adam and Eve, mankind had become so entrenched in sin and self that his entire way of life centered on EVIL! Sadly, even after God's punishment of sin by death, man still did not learn his lesson.
Shortly after the flood rebellious humans tried to build a giant tower in order to SAVE THEMSELVES should the waters rise again! Instead of considering repentance and turning to God, mankind sought ways to thwart him should he again fill the earth with water. This tower existed in Babel, which would eventually become Babylon. God's solution to man's hard heart was different than the one used before the flood.
5 But the LORD came down to look at the city and the tower the people were building. 6 "Look!" he said. "The people are united, and they all speak the same language. After this, nothing they set out to do will be impossible for them! 7 Come, let’s go down and confuse the people with different languages" (Genesis 11:1-2, 4-9)
Virtually every culture since man scattered throughout the earth has maintained (in one form or another) a legend of a "great flood." Often, the traditions that sprung from the legend are associated with a period known as "the day of death" as well as a "new beginning." These traditions occur in the fall of the year, near the time when most people celebrate Halloween, specifically during the period between the end of October and the beginning of November.
Regarding the link between the flood and Halloween one scholar writes the following.
"What is often overlooked, however, is that there is the remembrance of the 'Day of the Dead,' followed by a New Year. This occurs on our (modern Roman-based) calendar at the end of October or the beginning of November" (Frank Humphrey, The Great Flood and Halloween).
Below are some examples of how widespread a day dedicated to the dead, occurring around the tradition date of Halloween and when the flood started, have become with humans around the world. This list is paraphrased from Humphrey's book.
"In ancient Assyria the ceremonies for the souls of the dead were in the month Arahsamna, which is Marcheswan [mid-October to mid-November]."
In Egypt, it has been known for a long time that Osiris' box or coffin, which floated on water for a year, was a distorted Egyptian memory of the Flood. A well-known Greek historian in the first century A.D. stated that Osiris, the Egyptian god of the underworld, was on the 17th day of Athyr (corresponding to an October to November timeframe) placed tightly in a box and put afloat on the waters.
In parts of Europe, "November 2 is . . . the Day of the Dead."
In India, the Hindu Durga celebration for those who have died was first tied to their New Year (which began in November)
The "early Anglo-Saxons called November Blood Month," while Celtic inhabitants of Britain observed the beginning of their year in November.
Aboriginal Australians, in the fall each year, put white colored stripes on both their legs and arms to symbolize a skeleton.
In Wales and Scotland, "early November is the time for ghosts to be remembered."
The ancient Peruvian Incas began their year in November with a celebration called Ayamarka - which concluded with the placing of food and beverages on the graves of the departed. The Aztecs also kept a day for the dead in the fall.
Humphrey concludes his remarks regarding the link between the flood and the Halloween holiday.
"The legends cited . . . are found all over the world . . . yet they all have in common this remembrance of death . . . at the end of October and the beginning of November"
All the above are tantalizing clues as to the real origin of Halloween. Is it possible that the holiday is a perverted memorial to the people who, before Noah's Flood, practiced "evil continually" and who, some may feel, unjustly were put to death?