[FeatureRush]

First your comment reads quite... emotional? Both aggressive and defensive, almost to the point that one wants to avoid the discussion, but you asked in the edit so I reply. I assume you deeply care about the subject, but you need to understand, that if you want others to understand and maybe adopt your view it's better to tone down, avoid many short accusing questions etc... Also defending/explaining war by "but they started first before" always put you in a bad light...

Now, about how are you wrong. Wrong is too strong word here, I'm unfamiliar with many historical events you mentioned but I assume they really did happened. The general idea that Great Schism was a big source of tension, and directly and indirectly by events that resulted from it is and will be a source of tension, this is also true. The problem as I see it is the strength of this effect, you are right that it exists, but your comment reads as it was the dominating force that shaped this part of history, which many people not agree with. You also leave out many historical events that do not fit in, like Russia and Prussia working together to conquer PLC and later attacking Poland in 1939... Similarly when for example Napoleon attacked Russia, the west-east conflict was not the reason, it was just a tool to reinforce the conflict, and Napoleon actually wanted to conquer all and Russia was just one of many...

Wars can start for more "practical" reasons too (like oil) and historical/religious/ethnic reasons will soon follow, they can be present but they are not always the main reason.

Finally that bit about NATO troops could for some people change your comment from "comment about history" to "comment about politics pretending to be about history"...