It's not religion..believe me. It's something else

[Angrboda]

Hell, you know very well that when people fought, it usually is for money or land. 

This is certainly correct, and bears repeating. 

Wars labelled as religious have very seldom been fought over what religion will be practiced. Religion becomes an excuse or a rallying point, or a recruiting tool for soldiers, but the goals of the leaders are power and money.

For example people will still point to the Thirty Years' War. At the beginning there was some religious motivation there. Politically powerful Protestants were fighting politically powerful Catholics for political control. So lines were divided by religion, and it caused political regions to divide, but that wouldn't have happened without unsustainable inheritance practices in German-speaking areas. More importantly, the war was sustained and dragged on because Catholic France, under Richelieu, saw it as an opportunity to undermine the Catholic Habsburgs. So for most of the time it was in essence two Catholic powers fighting for dominance in Europe. To call it a religious war is oversimplification to the point of error. 

Wars have always arisen, and arise today, from territorial disputes, military rivalries, conflicts of ethnicity, and strivings for commercial and economic advantage, and they have always depended on, and depend on today, pride, prejudice, coercion, envy, cupidity, competitiveness, and a sense of injustice. But for much of the world before the 17th century, these “reasons” for war were explained and justified, at least for the participants, by religion. Then, around the middle of the 17th century, Europeans began to conceive of war as a legitimate means of furthering the interests of individual sovereigns. (Emphasis mine).

~ Axelrod, Alan & Phillips, Charles. Encyclopedia of Wars, quoted in Fact Check: Religious Wars: Only 123 of 1763?