The Apostle Paul from Romans 14:

One person esteems one day as better than another, while another esteems all days alike. Each one should be fully convinced in his own mind. The one who observes the day, observes it in honor of the Lord. The one who eats, eats in honor of the Lord, since he gives thanks to God, while the one who abstains, abstains in honor of the Lord and gives thanks to God. For none of us lives to himself, and none of us dies to himself. For if we live, we live to the Lord, and if we die, we die to the Lord. So then, whether we live or whether we die, we are the Lord’s. For to this end Christ died and lived again, that he might be Lord both of the dead and of the living.

The Apostle Paul from First Corinthians 8:

Eat whatever is sold in the meat market without raising any question on the ground of conscience. For “the earth is the Lord’s, and the fullness thereof.” If one of the unbelievers invites you to dinner and you are disposed to go, eat whatever is set before you without raising any question on the ground of conscience. But if someone says to you, “This has been offered in sacrifice,” then do not eat it, for the sake of the one who informed you, and for the sake of conscience—I do not mean your conscience, but his. For why should my liberty be determined by someone else’s conscience? If I partake with thankfulness, why am I denounced because of that for which I give thanks? So, whether you eat or drink, or whatever you do, do all to the glory of God. Give no offense to Jews or to Greeks or to the church of God, just as I try to please everyone in everything I do, not seeking my own advantage, but that of many, that they may be saved.

The basic stance of monotheism is faith and thankfulness. God is grace and faithfulness so our attitude must be trust and grattitude.

So no matter what anyone tells you about civil religion or the questionable roots of any holiday, I hope the Spirit enables you to give thanks to the true and living God and his Son Jesus–today and every day, whether a bird is involved or not.