Harald and George
To me, it is not that important if he was a Dane or a Norwegian Viking, the historians isn't even sure of his origin. Rollo was to my best of knowledge given Normandie by the Frensch to leave Paris alone and not keep horrasing the people of Paris. Danish and Norwegian and most likely Swedich vikings sailed togheter, because the also made alliances.
Regarding Odin and all the rest of our gods.
I do not belive that the gods of our ancestors is a saga or a storrie. The reason is quiet simpel, when we where being Christians the church had to get ride of our old gods. Dansich churces are build on old headen hollyplaces, you will in many danish churches find old runestones, the churches are often found at high grounds. when we are cellebretting christmas we still call it Jul (Joel), it is a cellebretion of the comming of the light.
So I belive that Odin, Thor and the rest of the lot have actually exsistet. We have a lot of town names starting with the names of the gods. Odenese(Odin) Tyrsted (Tyr) Thorsager(Thor) and i could keep on, Bornholm has a town called Gudhjem( translated Home of the God), I could go on, but I would never call the Nordich gods for a fairytail, the church, has made them to a SAGA, because they had to get people belive in only one god.
Kind regards
Per