Odin and Jesus are the same dude
They both were technically crucified, died, and came back. They all know what is, what was, and what will be. Hell, they're both bearded and have long hair. Both believed in something greater - even Jesus prayed to God - and they both talked of trivial philosophical things, and guess what? They are both symbolized by birds.
The common ideas for a religion around the world - I mean let's face it, we are not a creative bunch. You say something, so I like it - I'm going to tell others. Additionally we're all going to seek out the same virtues, because we all want the same thing. No one in their right mind truly wants confusion and chaos - notice I said right mind, so I'm totally excluding myself from this because personally I think confusion and chaos is where we should steer for a bit, but that's besides the point.
Give any two religions (and for the sake of the argument I'll even include scientology if we can get away with metaphors) and actually look and you'll find thousands of similarities - some a lot closer to that. You take what you have, a tree and fire and water and sand and earth and thunder, and you have miracles and signs, all the stories have the elements very prominently explored. Stars, and seasons, and all of these things, disasters and treachery and -here's the most common trend among saviors and wizened old men- knowledge beyond/inspiteof/from suffering.
Four crystals to save the world is our common joke involving the originality of games. It's only just so much less original than our conveyance of religion.