They have no bearing on our salvation, if our hearts are not given over to idolatry in the first place. If you had a problem with worshiping Ishtar before becoming a Christian, then don't celebrate Easter. But if, in your heart, the holiday is completely about the resurrection of Jesus Christ, eating a chocolate bunny on that day does nothing to corrupt your heart unless you equate doing so to actual pagan worship. Iow, if you eat that chocolate bunny as an act of worship to a pagan god, then you have crossed the line. But if you are just eating a snack because it is more available on that day, God looks on your heart and does not condemn you for what you are doing outwardly. It is what is going on in your heart that matters the most.
But I think that the principle in 1 Corinthians 8, 1 Corinthians 10:23-33, Romans 14 also applies. Which is to say this: Even though I would not be sinning by eating a chocolate bunny on Easter, I will not eat a chocolate bunny on Easter if I find that it goes against the conscience of my brother or sister. For why is my liberty judged by another person's conscience? "The earth is the LORD's, and the fulness thereof"
I do not want to embolden my brother or sister to do something that goes against their conscience. Through my knowledge (that an idol is nothing in the world) shall my weaker brother perish for whom Christ died? God forbid. In so sinning against the brethren, by wounding their weak conscience, I would be sinning against Christ. Therefore if what I eat makes my brother to offend, I will not eat a chocolate bunny while the world stands.
However, it is also true, that blessed is the man who does not condemn himself in the thing that he allows.
Because it is primarily a heart issue.