Here is a thoughtful article from author, Karen Armstrong in Guardian (11 july 05). One quotable paragraph from that article,
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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.