"Christmas" and "Easter" are pagan festivals. They are not found in the Bible. The LORD God does not approve of worship in this way. As it is written:

“When the LORD your God cuts off before you the nations whom you go in to dispossess, and you dispossess them and dwell in their land, take care that you be not ensnared to follow them, after they have been destroyed before you, and that you do not inquire about their gods, saying, ‘How did these nations serve their gods?—that I also may do the same.’ You shall not worship the LORD your God in that way, for every abominable thing that the LORD hates they have done for their gods, for they even burn their sons and their daughters in the fire to their gods. “Everything that I command you, you shall be careful to do. You shall not add to it or take from it. (Deuteronomy 12:29-32 ESV)

Thus says the LORD: “Learn not the way of the nations, nor be dismayed at the signs of the heavens because the nations are dismayed at them, for the customs of the peoples are vanity. A tree from the forest is cut down and worked with an axe by the hands of a craftsman. They decorate it with silver and gold; they fasten it with hammer and nails so that it cannot move. Their idols are like scarecrows in a cucumber field, and they cannot speak; they have to be carried, for they cannot walk. Do not be afraid of them, for they cannot do evil, neither is it in them to do good.” (Jeremiah 10:2-5 ESV)

See to it that no one takes you captive by philosophy and empty deceit, according to human tradition, according to the elemental spirits of the world, and not according to Christ. (Colossians 2:8 ESV)

Remember:

One who believes in the Son has eternal life, but one who disobeys the Son won’t see life, but the wrath of God remains on him.” (John 3:36)

Here is the perseverance of the saints, those who keep the commandments of God and the faith of Jesus.” (Revelation 14:12)

Yeah, I'm a c/Christianity mod, I jump in on such threads. But my nuance would be that I don't want you to "convert" anything unless it's what you want. I would think that everyone would want to be turned more toward what is true, and if that's the trajectory than specific turnpoints are less relevant.

Why do you celebrate Jesus's birth and death and what do they mean to you?

I don't keep secrets, I share what I have and others do too. I (and the churches in general) don't have explicit details on most of Jesus's upbringing. I have learned to spot Jesus in many other things, including the appearances of God sprinkled through the Scriptures, so that I've gotten to know him enough to know the kind of things he did from 9 to 29 AD, such that it's not important to me where he went or what he learned at that time because it can be judged by what can be known confidently of him.

I said specifically that it's a liberating discovery to know faith doesn't conflict with reason as you hinted they might. Belief that Jesus can do what he says has never conflicted with what can be found out by reason through facts and logic. You imply that the church has asked you to believe something contrary to logic. Permit me to apologize on behalf of the church for anything that might have given you that impression: there is never a contradiction, there is only a deeper logic that both transcends and subsumes any logical difficulty that may appear.