Here is a thoughtful article from author, Karen Armstrong in Guardian (11 july 05). One quotable paragraph from that article,
We rarely, if ever, called the IRA bombings "Catholic" terrorism because we knew enough to realise that this was not essentially a religious campaign. Indeed, like the Irish republican movement, many fundamentalist movements worldwide are simply new forms of nationalism in a highly unorthodox religious guise. This is obviously the case with Zionist fundamentalism in Israel and the fervently patriotic Christian right in the US.