(a) If Odin exists, then whoever doesn't believe in him will end up being eternally tormented and sent to Helheim.
(b) If Odin exists, then whoever believes in him (and dies in battle!) will gain eternal life in Valhalla.
(c) If Odin doesn't exist, then whether or not people believe in him can't matter very much.
(d) Hence [from (a)-(c)], non-Odininsts are running a grave risk. At the very least, the expected utility of their belief situation is infinitely worse than that of true believers.
(e) But such people are able to self-induce Odinistic belief.
(f) Therefore [from (d) & (e)], all non-Odinists ought to change their beliefs and become true believers in Odin.