Also, a meta commentary @dang - why are a number of comments against the IRA being downvoted? There were no saints in the Troubles and it’s startling to see comments opposing an actual sectarian terrorist group being downvoted to oblivion.
Ditto, though I'm more inclined to suspect my War on Terror comment. "Terrorist" - similar to "witch", "*igger", "atheist", "commie", "homosexual", and a number of other terms which change over time - seems mostly a label to stick on a person or group in order to proclaim that it is "okay" to hate, dehumanize, commit atrocities against, etc. them. For all too many folks, their "Licence to Hate" is one of their most precious possessions.
I haven't downvoted you. But this story (ie that told by your interlocutor) doesn't sound credible to me. The fault line in Northern Ireland isn't religious, but between (Irish) nationalists and (British) unionists, for which Catholic and Protestant identities are only proxies.
There is a long history of Protestant involvement in the Irish nationalist movement, up to and including the Troubles. The lead trainer for the IRA during that period (whose name I'd have to look up) has given interviews emphasizing that religious identity was not a valid criterion for target selection. If I remember correctly the interview is in the first or second episode of the recent BBC series on the Troubles.
If you're not familiar with this cluster of memes, give a quick read to a far-better-known example here: https://en.wikipedia.org/wiki/Charles_Coughlin Though my old acquaintance differed from Fr. Coughlin on a number of points.
Vs. any IRA leader, speaking to a wider audience in the media, would have obvious PR reasons to downplay the religious aspects of the conflict. Nothing special about this.
Also worth a read: https://en.wikipedia.org/wiki/Sectarian_violence_among_Chris... and https://en.wikipedia.org/wiki/Cromwellian_conquest_of_Irelan... The history of Ireland has very clear, hellishly brutal Catholic vs. Protestant roots for the more-recent Troubles.
Irish nationalists had opportunistically friendly relations with Germany during WW1 but not really during WW2, and most Irish that traveled to the Spanish Civil war fought on the Republican side, though some threw in with Franco because of his support for the Catholic church.