My family came to Mexico mostly from the Spanish Pyrenees in the late 16th-early 17th centuries, so they had bred with individuals from various tribes of Native Americans by the time they got to what is now S.W Texas, where Basque surnames are quite common, even now-so we are Hispanic/New World Catholic.
My husband’s grandfather was Canadian French, from Quebec, and emigrated to the US. They were traditional French Catholics, and it was very different than what I am used to, but he thought my statue of Lady of Guadalupe, the candles and incense I light there, and my altar with the crucifix, flowers, food and wine for dia de los muertos was weird, too. Same faith, different customs.
My cousins have north american indian (my side of the family), south american indian and galician dna. And Irish on their mom’s side. LOL.
The maternal grandmother was from a ‘high class’ family that was from money. Which might explain the difference in Catholic practice wrt tradition.
Any idea where your mtDNA is from?