I think that Religious CB should always be available. However, a RR risk after tech 40 might be in order?
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"Matthias". A whisper was heard to King Matthias of the Kalmar Union in the middle of the night. "Uh, are those Swedes counter-attacking Stockholm again? I'm getting tired of this bullcrap they pull-". The voice said, "No, those are below me. Wake up, and look who I am". Matthias light the candles near his bed, and saw a muscular man holding a hammer.
The mysterious man who disturbed Matthias
"Thor!?", he gasped in shock. "Yes", said the man, "I have come from Asgard, presenting you with a gift. Odin and the rest of us whole heartingly approve of the uniting of our followers, and we will assist you as needed". He then outstretched his hand, with his hammer being presented to the king. "You want to give me Mjölnir?", Matthias said, not believing this was real. "Of course not, no one but a god could wield Mjölnir. However, this will be your own hammer, Udødelighed. Take it".
Matthias quickly took the hammer, and started looking at it in awe. Thor continued, "This hammer has an ability unlike any other. For any mortal trusted by gods to wield it shall live forever more. You can still die in combat, but you will not age, you will always recover from illness, and other crippling things have no effect. Our only request is that you will fight in battle directly with your troops, for a true Norseman is a warrior. If we deem you a coward, we will take the hammer from you, along with the immortality, and you will never see Valhalla or Fólkvangr. However, I can tell you that upon your death in battle, you'll go to Valhalla. We have prior arrangements".
Matthias nodded to Thor, at a lost of words to say. "There is nothing more to be said now. I will now return to Asgard. Remember, Odin, me, and the rest of the gods will help our chosen people out. As long as you are faithful, you shall never fail". And in one instant, Thor was gone. Matthias looked at Udødelighed again. He whispered, "I will not fail you", blew out the candles, and went back to sleep.
(Hey, if AA can have an immortal, I can have the Norse pantheon give slight benefits to my nation.

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