The Real IRA is by no means Catholic, except that it’s adherents are, like the IRA before it, drawn from the Catholic population of Ireland. It pursues the same socialist, anti-British agenda that has always been the mainstay of Irish Republicanism. While considered “Catholic,” from the perspective of the Protestant-Catholic divide in Northern Ireland, Catholicism is irrelevant: the Real IRA is an atheist/Marxist terrorist organization.
That the Real IRA has Islamist bedfellows should therefore be no more surprising than that the Marxist Obama regime was in love with the Muslim Brotherhood.
They all loathe the principles of freedom, coexistence, and small government and want to bring about an all-encompassing dictatorship of the proletariat by means of violence.