Yeah, the Irish are pretty assimilated these days.
I've always wondered when did anti-Irish prejudice in America end?
When the tensions between mainline Protestants and Catholics ended, as the Civil Rights revolution heated up. These days, the two groups from a religious standpoint on anything that matters are not very different at all (putting aside the abortion issue).
I think that both groups are more divided politically then religiously with liberal Protestants and Catholics having more in common then either do with there more conservative brethren. Though on issues like abortion and birth control there's admittedly more cognitive dissonance for left-leaning Catholics since they actually are in the same church as the right-wing opus dei types whereas UCC Christians don't have to share the pews with evangelicals.