Well my good friend and neighbor is Mexican American, a retired Command SGM which outranks your VA buddy. He says different. His Protestant family members vote Republican and his Catholic family members vote DemonRat. All the while bemoaning the “illegal” situation in San Antonio.
So he passed on this info to me so I know it’s accurate. Plus I have had a chance to chat with his family during his quarterly TexMex BBQs.
The difference is that that in your case the evidence only support that it is RCs, white and Latino, who provide most of the liberal vote, while the Prots who do so usually belong to denominations who deny the primary distinctive of the Reformation, while those who hold most strongly to Scripture literally being the wholly inspired and accurate assured word of God are the most conservative.
By 2007, the majority of the Latino electorate was Catholic (63%), and 70% of all Latino eligible voters who identified as Democrats were Catholics.- http://www.pewhispanic.org/2007/04/25/changing-faiths-latinos-and-the-transformation-of-american-religion/
Latino Evangelicals are 50% more likely than those who are Catholics to identify with the Republican Party, and are significantly more conservative than Catholics on social issues, foreign policy issues and even in their attitudes toward the plight of the poor. http://pewforum.org/surveys/hispanic