All Hallows Eve (Halloween) and All Saints Day are further examples of Christians re-appropriating pagan holidays for Christian purposes. Like was done with Christmas and Easter -- though Halloween has proved more difficult to unmoor for its pagan past. In its Christian origin All Hallows Eve was a time to remember the departed saints. (You can see how this could lend itself to less sacred and more ghoulish themes.) The idea was to remember the departed saints because they still belong to the communion of saints. Because we believe in resurrection (and being with the Lord in the interim), we understand the body of Christ, the communion of saints, to be comprised of both the quick and dead, the living and those who sleep in Christ.