While I agree with your postings about Christmas, this is not correct information either. If you want to go strictly on biblical terms there are no days made holy by God except for the days that are specified and spelled out in Leviticus chapter 23. There are no other days that were ever made holy by God and these days were never made unholy by God. They are God's days:
Lev 23:4 These [are] the feasts of the LORD, [even] holy convocations, which ye shall proclaim in their seasons.
These are the same days Christ observed and that Paul observed.
1 Cor 11:1 Imitate me, just as I also imitate Christ.
1 Cor 11:2 Now I praise you, brethren, that you remember me in all things and keep the traditions just as I delivered them to you.
"For this is the covenant that I will make with the house of Israel after those days, says the Lord: I will put My laws in their mind and write them on their hearts; and I will be their God, and they shall be My people. ... In that He says, "A new covenant," He has made the first obsolete. Now what is becoming obsolete and growing old is ready to vanish away." (Heb. 8:10,13)
They were feast days that were observed only by the Jewish nation, but not by the universal Christian church, since they were tied to the temple which was destroyed.
"After this there was a feast of the Jews, and Jesus went up to Jerusalem."
"Now the Passover, a feast of the Jews, was near."
"Now the Jews' Feast of Tabernacles was at hand."
Paul never encouraged anyone to observe these days as part of an ongoing new covenant tradition.