I am not sure why you might feel the need to turn Thanksgiving into another testimonial for Holy Mother Church. Can’t Protestants have anything to themselves? The converts say no.

Taylor Marshall claims:

The first American Thanksgiving was actually celebrated on September 8 (feast of the birth of the Blessed Virgin) in 1565 in St. Augustine, Florida. The Native Americans and Spanish settlers held a feast and the Holy Mass was offered. This was 56 years before the Puritan pilgrims of Massachusetts. Don Pedro Menendez came ashore amid the sounding of trumpets, artillery salutes and the firing of cannons to claim the land for King Philip II and Spain. The ship chaplain Fr. Francisco Lopez de Mendoza Grajales chanted the Te Deum and presented a crucifix that Menendez ceremoniously kissed. Then the 500 soldiers, 200 sailors and 100 families and artisans, along with the Timucuan Indians celebrated the Holy Sacrifice of the Mass in gratitude to God.

Christine Niles acknowledges Thanksgiving’s associations with English Protestants but also points out how marginal those Protestants were:

Queen Elizabeth had little patience for Catholics, but even less for Calvinists, who complained the Church of England remained too papist. In their desire to complete the Reformation and “purify” religion of popish trumperies, the Puritans broke from the Anglican Church, rejected the Book of Common Prayer, and preferred the anti-royalist Geneva Bible to the King James version. They instituted an independent congregationalist ideal that upheld the notion of the common priesthood of all believers, and thus granted an equal say among congregants in the election of the minister (some claim the roots of American democracy lie here). All of this naturally brought down on them the wrath of the Crown, and persecution commenced. A number of Puritans fled England and sought refuge in Holland, where they lived for a dozen years, before deciding to leave for the New World. After meeting another group of Puritans in Southampton, all boarded the Mayflower on September 16, 1620. Sixty-five days later, they sighted Cape Cod. The communal meal we know of as “Thanksgiving” took place in 1621 with about ninety Native Americans, and lasted three days.

And then Ray Cavanaugh argues that Squanto, a convert to Roman Catholicism, made the first Thanksgiving possible:

He bequeathed his possessions to his English friends, all of them Protestant Puritans who, despite their own need for religious freedom, were not especially tolerant of Catholicism. One wonders if these Puritans even knew of their benefactor’s Catholic conversion.

But the guy who wrote the book on the first Thanksgiving, Robert Tracy McKenzie, reminds readers that:

Overwhelmed by God’s gracious intervention, the Pilgrims immediately called for another providential holiday. “We thought it would be great ingratitude,” Winslow explained, if we should “content ourselves with private thanksgiving for that which by private prayer could not be obtained. And therefore another solemn day was set apart and appointed for that end; wherein we returned glory, honor, and praise, with all thankfulness, to our good God.” This occasion, likely held at the end of July, 1623, perfectly matches the Pilgrims’ definition of a thanksgiving holy day. It was a “solemn” observance, as Winslow noted, called to acknowledge a very specific, extraordinary blessing from the Lord. In sum, it was what the Pilgrims themselves would have viewed as their “First Thanksgiving” in America, and we have all but forgotten it.

As we celebrate Thanksgiving today, perhaps we might remember both of these occasions. The Pilgrims’ harvest celebration of 1621 is an important reminder to see God’s gracious hand in the bounty of nature. But the Pilgrims’ holiday of 1623—what they would have called “The First Thanksgiving”—more forthrightly challenges us to look for God’s ongoing, supernatural intervention in our lives.

None of these accounts can dissuade me from my ambivalence about this holiday at this point in this nation’s history. On the one hand, it is the best holiday of the year from the perspective of food, drink, and leisure. On the other hand, the covenant theology that informs a national day of thanksgiving (or fasting) does not fit the conviction that no nation occupies the status that Mosaic Israel did (not to mention fitting a society inhabited by Roman Catholics, Protestants, Jews, Muslims, and agnostics). Over at Front Porch Republic I develop this ambivalence.