I take the commands of the Lord and believe them when he specifies HIS holy days. He does not mention Easter or Christmas.
I also try to follow (albeit imperfectly) the examples he set while incarnate. These include observing the holy days he himself observed while incarnate. Our duty as Christians is to walk as he walked:
1Jn 2:3 Now by this we know that we know Him, if we keep His commandments.
1Jn 2:4 He who says, "I know Him," and does not keep His commandments, is a liar, and the truth is not in him.
1Jn 2:5 But whoever keeps His word, truly the love of God is perfected in him. By this we know that we are in Him.
1Jn 2:6 He who says he abides in Him ought himself also to walk just as He walked.
You posted:
“1Jn 2:6 He who says he abides in Him ought himself also to walk just as He walked.”
So you believe in animal sacrifices? Jesus did in His days on this earth before His own sacrifice.
But the Church which He founded for us DOES. The Catholic Church is His provision for our care, and His Church, in Her wisdom and with the guidance of the Holy Spirit, sees it entirely fit and proper to celebrate the birth of God as Man, to soberly and coldly reflect on His Crucifixion for the remission of our sins, and to celebrate in His Resurrection His triumph over death.
I eat Christ’s Body and drink His blood, as he commanded us to do.
But I don’t - for instance - celebrate Passover. That was a commandment from God to the Jews. It is not a commandment from God to the gentiles. That’s because we were never slaves in Egypt.
I also don’t observe the dietary restrictions of the Old Testament. They were commandments from God to the Jews: but we can eat what we want - as revealed by Christ.
And I can walk across unmarked graves without contracting ritual impurity. And I don’t have to bring doves to the temple as an offering for sin. Why? Because God became Man and has become our Sacrifice for Sin.
We imitate Christ by being Christ-like, not by being Jewish.
Just out of curiosity, do you eat shrimp?