w13 7/15 p. 11 par. 6 “Look! I Am With You All the Days”
Still, there were numerous religious groups who claimed to be Christ’s followers. So a crucial question needed to be answered: Who among those groups were the wheat? To settle that question, Jesus began to inspect the spiritual temple in 1914. That inspection and cleansing work involved a period of time—from 1914 to the early part of 1919.
ws14 1/15 pp. 8-13, "100 Years of Kingdom Rule—How Does It Affect You?"
After Jesus cleansed the heavens of the bad influence of Satan and his demons, Jehovah had Jesus inspect and refine his followers here on earth. The prophet Malachi described this as a cleansing. (Malachi 3:1-3) History shows that this cleansing happened between 1914 and the beginning of 1919. ... If we want to be a part of Jehovah’s universal family, we must be clean, or holy. (1 Peter 1:15, 16) We must keep our worship clean from the contamination of false religion or politics.
Christmas was evidently not included in the cleansing process, therefore Jehovah couldn't have been too bothered about it.
He chose them anyway - Christmas, crosses, birthdays ...
All deemed,
Spiritually clean,
In 1919.