In the Bible, thanksgiving does not have anything to do with turkey, or dressing. It has to do with thanking God, with acknowledging God as the maker and giver of all good things. God's love endures. God is merciful, even when our lives have taken us a long way away from God. The enduring, persisting, continuing love of God is the reality which shapes our world.
Thanksgiving is about recognizing that love, and acknowledging who it is who's responsible.
I'd like to point out a couple of things about thanksgiving. First, I'd like us to notice how many of the miracles which Jesus did, were preceded by prayers in which he gave thanks. Jesus gave thanks for five loaves of bread and two fish. Jesus thanked God for the unity, for the closeness which he and God felt for each other. And out of that prayer of thanksgiving was created the whole Christian church.