Utter rubbish. The invasion of Ireland got underway when the Normans invaded in 1369. Since then our history has been one of occupation. After the famine in which one million died and about another million emigrated. we had a remaining population of two million. Some threat !
Just before the Irish Free State was formed there was a plebiscite which showed a majority of 7:2 favoured a united Ireland. But in the North the "loyalist" community grabbed six of the nine counties in Ulster which were overwhelmingly Protestant, thus ensuring a majority in their favour.
From that point on there was discrimination against Catholics. Only property owners were allowed to vote in local elections and some businessmen got as many as ten votes. Guess who owned the propertuy and the businesses ! In general elections the boundaries were jerrymandered to ensure an overwhelming Protestan majority. Don't take my word for. If you take the trouble to look it up , you will find that the recommendations of the Boundaries Commision were ignored.
There was widespread discrimination against Catholics when it came to housing and jobs and that is really what Paisley and co. were shouting about when they talked about a return to "democracy" The wanted to maintain the status quo.
So I suggest the troubles were motivated by greed as much as religious bigotry, not that it made any difference to the man in the street.
Before you draw the wrong conclusion, let me tell you that I have no time for any religion. I share your dislike of the wretched Vatican but I equally detest the narrow-minded Protestant bigots in the North. Try living there. For my part, I am quite happy to live in England as I have done for most of my life.
Your idea of an invasion launched from Ireland is simply ludicrous. Imagine the Pope sending all forty or fifty of his Swiss guards to bring the British empire to its knees. I've heard many conspiracy theories in my time but yours is the most risible to date.
I am no expert on Irish history so I will not debate you on this subject. However, I was not referring to either an Irish or Swiss Guard invasion. The Pope has others to do his dirty work for him. I merely suggested it as a staging ground, like Cuba was for the Russians. I certainly doubt there was any fear of Castro leading an invasion of Cubans into Florida. Simply look at U.S. strategy in the Gulf. You can't invade until you have somewhere to invade from, and nothing works better than friendly territory. Does this not sound plausible to you?