Hi designs
I could take any Sacred day from any religion and try make it over to Jehovah or his son but it doesn't lessen what it is or how others use it.
Making the Golden calf over to Jehovah did not make it pure or acceptable.
These are the sacred celebrations of the pagan world that are considered sacred/special by the world. You say "special" yourself. Ask yourself why you consider them so "special" when they are simply a family gathering on an annual date. So "special" you had to do them secretly.
If the actual date of our birth is so important why isn't one single date of birth put in the Bible?