Two years before the more famous Thanksgiving at Plymouth a thanksgiving proclamation was made in the colony of Virginia. Before football. Before "Black Friday". Before Macy's parade. Before it was a holiday it was a holy day.
The proclamation read: "We ordaine that the day of our ships arrival at the place assigned for plantacon in the land of Virginia shall be yearly and perpetually keept holy as a day of thanksgiving to Almighty God."
"Holy" means set apart for God. So at the least we should not forget to Whom our thanks is owed.
(Please don't dare teach this to our children in the public schools. It would confuse them as to the origins of our nation. And they might ask about this God.)