Albert Mohler has kindly reposted his original article on Halloween. It is well worth the read.
Christianity and the Dark Side - What about Halloween
My wife and I have chosen to keep ourselves separate from this "holiday". In the past we have participated in Trunk-or-Treat or "harvest festival" events, but have found that at various levels these attempts at evangelism were feeble at best and only resulted in an excuse for Christians to do what everyone else was doing while feeling better about it. In the end we have felt that this is one of those occasions where "coming out from among them" was a better testimony. Why? Because sometimes it is important to demonstrate that we, the church, are not like the world.
We are sinners saved by grace. We are part of a fallen race starting with the father we all share with the rest of humanity and yet we all, in some mysterious way, bare the impress of God. Yet we are not like everyone else. We have been made new creations. We have been given new hearts of flesh, we have been sprinkled clean with water and we have been filled with the Holy Spirit (2 Corinthians 5:17; Ezekiel 36:25-27). This makes us fundamentally different than everyone else. However, unless this translates into a difference that is recognizable to a dying world it will mean little to those outside our own enclaves and christian ghettos.
For too long we have misused such passages as 1 Corinthians 9 to excuse our love for the world and the things in the world in order to blend in and feel comfortable with the secularization of the church, all the time claiming we are merely becoming "all things to all people". Has it worked? I think an honest look at the state of the church today should answer that question.