So maybe the reason for a war is usually money/power, but religion makes the wars possible.
Think again.
You suggest that those who abused their power would respectfully stop their aspirations if there was no such thing as religion, implying that there are no other ideological and cultural ideals that could be used. The main idea is to use something that is associated with the identity of the people, be it culture or ideology, and use it to get public agreement and support for wars which serve the purpose to acquire wealth, land, cultural influence and whatnot, by claiming that there is a threat to these ideals. Sounds familiar?
How is the point you are trying to make in line with two and more centuries full of non religious and most brutally fought wars? A fundamentalist religious person might even be tempted to say that technological progress has brought humans to the edge of self destruction, since spears and swords have never killed as many people as bombs and rockets. While this argument is regressive in nature, its comparable to yours since it confuses cause and effect; i.e. technological progress with wrong use if it and, in this case, religion and the abuse of it.