The war(s) between the denominations is mostly feckless ‘gotcha.’
All of the organized denominations are chock full of error, as witnessed by Yeshua’s letters to the seven churches. Only the church at Philadelphia was praised for retaining the first principles, and promised to be protected from Satan’s great tribulation.
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Perhaps you're right, but there are certainly causalities, just like in any war.
Not only with the Catholic/Protestant war in places like Northern Ireland, but with people everywhere who get disgusted with it and them and then reject the God and belief system that makes them both fight so much.
All too often, those who claim to be His and claim to follow His teachings are among the worst examples. You definitely can't tell they're Christians by watching or listening to them fight with or talk about each other.