If this is your premise it is wrong. If you look through history, some armies composed of Muslims fight well and some don't. Some armies composed of Catholics fight well and some run like rabbits at the first shot. So from this I gather that religion doesn't matter nearly as much as training, leadership, organization and whether the men get paid on time.
I would note also that every variation of Christianity that I know of believes in the soul continuing on after death. Which is also what us mackerel snappers are taught.
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