God has little to do with political plays. Not all muslim extremist are believers, just like not all the american politicians who say they're christians are actually christians[0]. More often than not, it's a facade from the leaders to draw in more pawn soldiers who believe in the cause.
You talk a lot about not having a clue on "the reality of the conflicts" and yet, you are unable to take a step back and look from the perspective of someone completely alien to the situation.
America has, time and time again, used and abused its armies for strategic and economical purposes (The "if you have oil..." meme has been beaten to death, hasn't it?). It certainly is willing to sacrifice innocent lives as long as it doesn't make the news - which it doesn't because of how hostile the entire country is to muslim ideals. And I've heard more than once the term "God" being thrown around by US politicians to justify these things. Does all of this ring a bell to you?
One of the sides is certainly a lot more barbaric than the other, what with the beheadings and what not... but whether your family is dying to american bombs or to barbarians doesn't really change squat for the victims. With the exception that one of them is actually less destructive - take a guess which?
[0] Since we're talking about countries with backwards ideologies, how is it that it's political suicide to be an atheist in the US? We have plenty of them in France and nobody gives a shit...
Edit: I'll add to this... It's really hard to take a step back and picture yourself as being the bad guy. It's nearly impossible, in fact. You are raised on one side of a conflict and you simply do not have the full picture unless you've yourself lived on the other side or been with people on the other side. But try to understand this: In these wars, there's no "bad guy and good guy". There's two bad guys and a lot of followers who have been completely brainwashed to think the causes are worthy.
Wars are not about justice. They're not about spreading culture, be that culture islam or democracy. We'd be at war with North Korea if they were about any of those things. Wars are strategic, and always about taking something away from the enemy, be it territory, riches or political power. The two sides are equally bad, and the civilians/soldiers on both sides only see how evil the other side is - they don't get to see the evil of their own.