3point14rat, I think we need to turn your “religious-like thinking” around, rather, and say religion often portrays “cult-like thinking.” To be sure, religion has often been used as a tool by effective leaders to motivate and manipulate their followers to fight a war, as have a wide variety of “cultic” approaches. But the causes of war are as varied as human motivations can make them. Most US wars have seldom been about religion. Even the racial overtones present in wars were more tools for leaders to use to motivate the fighting forces - the “yellow peril,” originating in the 1800s against Asian immigrants was readily adopted for World War II. Similarly, “kraut” and “hun” were adopted as derogatory terms in fighting the Germans in both World Wars. The Banana Wars, on the other hand, of the early 20th century were largely motivated by corporate greed and government connivance. The World Wars were fought for political reasons, not religious. Ancient wars, the various invasions of the Mongols, for example, or Alexander’s conquests, were to build and maintain empires for power and wealth.
Have there been wars for apparently purely religious reasons? The Muslim wars of expansion, or the European conquests of the Americas? Perhaps, but its unlikely that they would have gone for as long as they did without more fundamental reasons of greed and the wealth of empire, vice the desire to defeat infidels or convert heathens.
My point here is that, while religion has often been employed as a tool by leaders to motivate and manipulate their followers, they have seldom been the actual cause of war, and even as regards their use as a tool, religion hasn’t been the only such tool - racism, promised wealth, real or perceived threats, economic stress, etc., have all played their roles.
One of the problems people have in seeing this (and this applies in other areas as well) is that they fail to take a wide enough view and/or only seek out examples that tend to support their already set perceptions. Its certainly possible to hand pick wars that seem to have been about religion, but, if war is studied over history and around the world, it becomes clear that, even for apparently religious wars, its usually really about something else, and religion was just one of several often handy tools used by the war leaders.
For more on this subject, I recommend Fields of Blood: Religion and the History of Violence by Karen Armstrong.