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I tend to think that most individuals, who have roots in the Republic of Ireland, come from Catholic families. Also, as we both know, many Irish Americans have more of an Ulster Scottish background than a Native Irish one, and this likely skews the numbers. Then, some individuals are atheist or non-Christian, and a lot of them come from Catholic families. Some people come from "mixed" backgrounds, and they might identify more with just one parent's church.
All of that said, there are many Baptist and Pentecostal Americans who have Native Irish forebears and surnames. It's not all down to their ancestors' conversions from Catholicism to Protestantism. Some of them convert in the present day, or their great-grandparents might have done so, and that's especially true if they're "hybrids". You know more about this than I do, but I noticed that Irish people can be quite fervent in their beliefs, no matter what church they attend.
My (insert central casting Irish surname here) grandma and great aunt had feuds over whether Baptists or Church of Christ members were right. I found a descendant of my last immigrant Irishman ancestor, and he seemingly wrote "praise the Lord" every other word when we communicated. My "most Irish" forebear, from County Tipperary, became a Baptist preacher! I think that they're exceptions to the Catholic rule, but they're a part of the religious equation.
I noticed the same pattern with kids in school. They were from Appalachian regions, but they had Native Irish surnames. One good childhood friend of mine was almost like an evangelist, but he never forced or pushed his beliefs on people. I bet that their ancestors were equally devoted Catholics in Ireland, so it seems like Gaels might have a genetic(?) predisposition that makes them more fervently religious.
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