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Very logical counter, however, what's stopping the god(s) from just yanking said protection away? They could inform the kids of this if you had a reasonable DM, but if you have a malicious DM, they could let the kids march right to their deaths and still punish the PCs for convincing the kids they were un-killable when they weren't. Thus turning the would be heroes into the new villains on the run.
Considering some of the THAT DM stories i've read on /tg/, you'd be surprised who'd pull it. If you have doubts about that, lurk and find a thread in the archives with the text "WHAT THE FUCK IS A YELLOW DRAGON?".