I wouldn't say the IRA were Christian in the same sense ISIS/Daesh are Islamic. From what I know, the IRA are more driven by nationalism than religious fundamentalism. Probably the closest thing to an armed Christian fundamentalist organisation during the Troubles would have been Ian Paisley's "Third Force".
And what are IS/Daesh up to right now?
Building a nation. Historically its been rather difficult to split the concept of religion and nation/empire building.
In both cases (and the LRA in SS Africa) the religion and in particular the sectarian nature of it is deeply intertwined by the 'cause' of uniting/building a nation. A united Ireland the case of the IRA, the retention of NI in the case of the UDF and the building of a Caliphate in the case of IS.
What also links them is that in all these cases the main ones who suffer for it are people of the self same religion.
Religion is a bad idea in my opinion, but that doesn't mean that everyone who follows a religion is a fundamentalist, quiet the opposite is generally true.
That's the point I make in regard to the 'list' of what makes Islam the 'worst'. Not only is that list inaccurate for the majority of Muslims, but most if not all of the points can be applied to a great number of other religions once you look at the fundamental elements within them.
While women's rights are an issue in a lot of Muslim states, the exact same can be said for a large number of Christian, Buddhist and Hindi countries; the question once again becomes is this a directly religious issue, is it a cultural one or is it a complex mix of both these factors?
I could for example use the most populous Muslim country (Indonesia) and the most populous Christian country (the US) and conclude that the US is more biased against women on the basis that it has never had a female head of state. That would of course be an absurd simplification, yet that's the kind of thing we are seeing here.
I loved the movie "lone survivor" as it took a step back, tried to not get all apostal about right or wrong, but it showed both side inside what we sometime think is one camp, one extreme religion
What is even more interesting is when you read the actual events, as the big US saves the day bit at the end never happened. The Afghan villagers stood alone against the Taliban and saw off a number of night raids by them when they attempted to capture Luttrell.
http://en.wikipedia.org/wiki/Lone_Survivor_(film)#Historical_accuracy
Hollywood FTW