Especially since Hitler himself was Christian. As were frankly almost all medieval European rulers. Christianity has never stopped war (or suffering within wars) and in fact fueled a lot of it.
The fact that some general would make a justification like this is terrifying. If he genuinely thinks this would stop wars or suffering, he’s blatantly uneducated. The other option is that he knows what he’s saying is bullshit and it’s just meant to convince the Christian population, which says terrible things about both how the military is run and how gullible that population is