Halloween and Christmas as Church Practice

Deau 18:9-12 "When thou art come into the land which the LORD thy God giveth thee, thou shalt not learn to do after the abominations of those nations.  There shall not be found among you any one that.....useth divination, or an observer of times, or an enchanter, or a witch, or a charmer, or a consulter with familiar spirits, or a wizard, or a necromancer.  For all that do these things are an abomination unto the LORD: and because of these abominations the LORD thy God doth drive them out from before thee."

What about the practice of Halloween and Christmas?  Should we be putting Christ back into Christmas.  What's the harm of trick or treat, or bonfires, or witches or wizards or monsters and children pretending to be them. God says these things are an abomination, but it is great fun for the unthinking.  Truth should guide our thinking and not the world's idea of fun.

Should we be putting Christ back into Christmas?  the problem is that this question overlooks the question of whether or not these festivals are right at all.  There can be no Christian way of doing things that are wrong, so we cannot speak of the Christian way to observe these things unless they are legitimate in the first place."

Churches have Halloween parties, and Christmas trees in pulpits.  Should this be?  Can we Christianize that which God has not even commanded or hinted at?  

What biblical command or principle is there for celebrating Halloween or Christmas:  There is no command or principle at all.  We are told to remember the Lord's death and that is it. 1 Corinthians 11:26 "For as often as ye eat this bread, and drink this cup, ye do show the Lord's death till he come."  Neither Halloween nor Christmas was celebrated in scripture nor were they given a Christian veneer until the Roman Church..  until then both these celebrations were by pagans.. pagan festivals.  And both were hijacked by the Roman church and given an unbiblical Christian veneer.  Well what is the origin?