That would be like saying, Hey, we have this movie and now we play it in our church and so this movie is no longer really made by others outside our church. The movie is actually a part of our church now. It’s no longer a worldly movie.
Sorry, you cannot change reality.
I mean, lets just say hypothetically your church started this holiday somehow and secularists had distorted it and made their own version. Well, it really would not matter because the holiday is primarily celebrated even by atheists, and such. Where is one being holy and separate from the world like atheists when they kill each other in department stores to give each other gifts? Where is one being holy and separate by decorating a tree alongside atheists? Happy unity with all? I remember seeing a YouTube vid of a Christmas tree catching on fire because of the lights on it. This to me seems like a Judgment from God that folks shouldn’t do stupid and useless things. Just follow the Bible and don’t make up a bunch of added nonsense. Next thing you know people will be putting Christmas lights on animals and the animals will catch on fire. Really. It just dumb, and childish. People need to man up and follow God’s Word alone and not the words of men.
In other words, if you say you celebrate Christmas, folks are going to think you are celebrating the worldly secular version of it. I mean, why would they even have the same name whereby it would cause confusion?