Halloween for the Christian. Is it right or just plain evil?

Yes, most of our holidays are pagan in origin.
The Devil can do more than accuse. He can send his minions to tempt, harass and cause division. The work of Christ has given us victory over death. The Devil is not dead or powerless. On this day of the year, the veil between the worlds of death and life are the thinnest. Therefore, on this day more than any other, more spells and rituals are done because they have more effect. This day is more powerful than any other for those of the pagan, wiccan, Satanic persuasion - or as I put it, the left-hand path.
My family and I don't "celebrate" Halloween. We let them have basic costumes, but nothing of a violent or bloody nature. Most often, we take them to a church function such as a "fall festival" where they play games and have candy. There is no Biblical commandment against it that I can find. It is completely up to an individual what they do or don't do on this holiday.

Note: in my work against darkness and evil, I find that I have the most problems around this time. So, more often than not, I'm a little too busy "working" as opposed to celebrating. Spirits both "good" and "evil" are more active during this time.

Peace...