Halloween has been rebranded and celebrated by Christians over a thousand years, though certainly many traditions have changed.
“In the 7th century AD, Pope Boniface IV established “All Saints’ Day” … in the following century, perhaps in an effort to supplant the pagan holiday with a Christian observance, it was moved to November 1. The evening before All Saints’ Day became a holy, or *hallowed eve* and thus Halloween.”
This likely happened because Christian missionaries often re-branded ancient pagan holidays to better spread their message.
There is even a letter sent Pope Gregory I in the 6th century, in which he suggested that existing places of non-Christian worship be adopted and consecrated to serve a Christian purpose which is evidence this was a common Christian method, for quite some time now.
(Though I know people who think only this current generation of Christians “compromises” by “taking things from the world” and “trying to make it Christian.”)