I was reading some literature by Jehovah's Witnesses. Anyone who knows them knows they're very anti-happiness, refusing to celebrate Christmas, Birthdays, Easter, and most other Christian holidays. They also reject much of early Christian history as being apostate, the cross and the Trinity for apparently having pagan influence. I've met even some moderate Christians who also follow the same line of thinking up to a certain point, usually rejecting Christmas trees, Easter bunnies, Halloween, and what not, for their pagan roots. IMO these things are all acceptable because God has the power to transform things (even evil things) to support His Will. Afterall, that's what He has done with every Christian ever. One only need to look at St. Paul to know that an evil beginning does not bar someone, or something, from serving God.