Remember what Marx said about religion which is ironic because he founded a secular religion.
Power is probably the root cause for most strife but it is so intertwined with religion that it's hard to tell which came first the chicken or the egg. It's real easy to kill people and take their land when your God is on your side, and he/she must be because that's why you are winning, right?
Ever hear of Manifest Destiny? 19th Century Concept that America was ordained by God to occupy the land mass from coast to coast. Made it a lot easier to kill Native Americans and go to war with Mexico. Read up about President Polk and his followers and the Mexican American War sometime.
So yes most all of the wars of mankind have had religious aspect to them.
Marx clearly had the well being of humans in his mind:
Vol. I, Part 1, [The Materialist Conception of History].
Communism differs from all previous movements in that it overturns
the basis of all earlier relations of production and intercourse,
and for the first time consciously treats all natural premises
as the creatures of hitherto existing men, strips them of their natural
character and subjugates them to the power of the united individuals.
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