Halloween can be a time of the year when evangelical Christians really disagree with one another, and passionately so.  Some believe that Christians sin by participating in and Halloween-themed activities, while others believe that not participating in Halloween would be unthinkable for Jesus and therefore should be unthinkable for Christians.
Let’s please remember the covenant that we all hold to as members of the Free Grace Alliance:

In agreement with these affirmations, we covenant to work together graciously and enthusiastically to advance this Gospel of Grace, and to communicate with a positive and gracious tone toward all others, both inside and outside the Free Grace Alliance.

Whichever position you espouse, remember that it is not a central position to the truly amazing offer of eternal life through faith alone in Christ alone that God has brought us.  Keep secondary issues secondary this Halloween, and whether you are discussing the issue with a fellow member of FGA or with a believer in Christ who is not part of our group make sure to communicate in a positive and gracious tone.