For those of us that like to Celebrate Halloween!

Fall
Harvest season is wrapping up, people are slaughtering or hunting meat, and salting, smoking or drying it. When all of this is done, in time to prepare for winter, as the Fall Equinox approaches, it is time to party. The people need to gather together, and trade out stores for the winter. People whose crops failed need people to give them enough to survive the winter. They might go house to house and ask for what they need. Celebrations are held to celebrate the bountiful harvest… baskets are filled with the fresh good things of harvest – vegetables, dried fruits, gourds, meats – in such an abundance and variety that today we would call it a “cornucopia”. However, we mustn’t forget the dark side of this holiday. Just as mid-winter accepts death and looks forward to the hope of life, fall accepts life but looks forward to the imminence of death. The mysterious sources of sudden illness and death, “spirits”, must be dealt with. They are prepared to run free throughout winter, they are coming out of their realms to prepare to assault the people. So, we hang out gourds, carved to scare away even evil spirits, we light huge bonfires (made up of the dried sheaves of threshed wheat, probably) to scare them away, etc. Children, taking advantage of the scary mindsets, dress themselves in scary costumes, and the adults (who of course, are just indulging their children) pretend to be scared of these little evil spirits, and bribe the evil spirits with little treats to stay away from their homes this winter. The air of fear of death, while celebrating harvest, must have been an odd mixture. Pacify the evil spirits, and also try to scare them away.
In the British Isles, this was called the season of “Samhuinn”. This was literally just their name for the month we call November. The last day of the month before November was called “Oidhche Shamhna” – roughly, “November Night.” And apparently this was treated as the beginning of the year for the early Britons. The celebrations connected to this time were linked to the pagan groups, like the Druids.
So, how does this play out in regards to Christians holidays?
When the early Christian, mostly the medieval Roman Catholic Church, came to the far Western World (there were allegedly already some Christian influences there, possibly lending credence to the legend that the Apostle Thomas may have visited the British Isles before the turn of the first century), they began to interact with the local peasants and seek to convince them to convert from their pagan ways.

So, what about the end of Harvest? The people were “celebrating” Death and the preparation for death and winter. So, the Church came along and decided to celebrate what else? Martyrs. The Church had this celebration already, called “All Saints Day” sometimes celebrated by some at different time of the year, but in the mid-700’s, it was moved by Pope Gregory III to Nov 1st officially. Again, it was a great fit. Recognize in faith those who died in the name of Christ when the pagans are preaching fear of the spirits of the dead. The “eve” before All Saints Day was Holy (or “Hallowed”) Day Eve… which over time was shortened to “Hallowed ‘Eve”… Hallowe’en”. Still, they were mixed… the pagan “Fall Festival” or “Harvest Festival” mixed with the Christian
“Halloween”. (How ironic that most churches have fled from the word “Halloween” and moved to “Fall Festival”)… we party, we have bonfires, pumpkins, and costumes.
So, with all of these main celebrations being celebrated in a way that integrates all kinds of natural links, agriculturally obvious connections, pagan aspects of worship, and Christian teaching, what is the right response of the modern believer?
1. Halloween is derived from Samhain. Samhain was/is a festival held at the end of harvest season. It also marked/marks the end of the Celtic year. Feasts were/are made in remembrance of dead ancestors (i.e. “Feast of the Dead”) and as a declaration of life continuing on (i.e. “The Circle of Life”).
2. Yes, Samhain/Halloween is of Pagan origins. However, Paganism is not the worship of the devil, Satan, Lucifer, or any other “evil being”.
3. Satan/the devil/Lucifer originates from the Abrahamic religions (i.e. Christianity). This evil-doer does not have a thing to do with Paganism or the Celtic Holiday of Samhain. Never did and never will.
4. While I’m sure some crazy, sick people use Halloween as a time to participate in Satanic activity, I can assure you that this is not the norm nor is it condoned within the Pagan community… or any community for that matter. Also keep in mind, the ones that do participate in Satanic activity and/or consider themselves Satanists, do so year round. After all, a Christian is a Christian all year round and not just on Christmas, right?
5. Now that we’ve cleared up the Pagan origins of Halloween, let’s take a peek at the Christian origins of this “evil” Holiday… All Saints Day. Now, if you are a Christian, then you should know all about this. If not, here’s a little info: All Saints Day is celebrated on November 1st (the day after Halloween, just in case you were confused). This Christian Holiday is to honor all of their saints. That’s right, DEAD saints. See, Christians also honor their dead at this time of year. Moving on, this Holiday is significant to this post because it is all called “All Hallows”. Therefore, the night before All Hallows is “All Hallows Eve”. Keep simplifying “All Hallows Eve” and we end up with HALLOWEEN!

-http://chrismlegg.wordpress.com/2010/10/25/historical-understanding-of-halloween/
-http://lifewithzacnbrook.wordpress.com/2009/10/16/halloween-controversy-halloween-is-satanicevil/