Let us presume a monotheist cosmology. There is but one deity. Let us further presume that this deity is "good". However, this deity is also somewhat distant. For "the good of free will" or whathever reason, deity has absented from direct intervention, instead granting clerics divine magic.
But a side-effect of this distance is that demonic forces can also meddle, and they likewise grant "divine" magic, although it is actually infernal lies meant to draw people away from the truth. The demonic forces even pretend to be benevolent, at least for a while...
So, what happens when two countries that both worship deity are at war?
Alternative one: Neither sides divine magic work against each other.
Alternative two: deity actually withdraws divine magic but infernal forces then try to worm their way into the matter, enticing, tempting, pretending to be deity, slowly perverting the religion.
Of course, human nature being what it is, I foresee that, over time, the majority of people will be under the yoke of demonic forces, tempted there by promises and lies like "deity is on your side in this war"...
But a side-effect of this distance is that demonic forces can also meddle, and they likewise grant "divine" magic, although it is actually infernal lies meant to draw people away from the truth. The demonic forces even pretend to be benevolent, at least for a while...
So, what happens when two countries that both worship deity are at war?
Alternative one: Neither sides divine magic work against each other.
Alternative two: deity actually withdraws divine magic but infernal forces then try to worm their way into the matter, enticing, tempting, pretending to be deity, slowly perverting the religion.
Of course, human nature being what it is, I foresee that, over time, the majority of people will be under the yoke of demonic forces, tempted there by promises and lies like "deity is on your side in this war"...