I'm not sure if this thread is still left open to answer really, but I'll throw in my two cents.
Thor is a god because he has always been a god. The Aesir falling out of popular faith does not demote the fellow from his status among a proud pantheon of our ancestors.
If we wonder if Thor has been on earth before... well if we refer to the eddas (and please do forgive me for not looking up which passage it is) Thor is said to have at least been in midgard long enough to fish for the world serpent.
Re: why do they call him gods By: Stabby / Beginner
Post # 5 Oct 15, 2016
One thing to remember about the Eddas is that some of it is conflated with history as Snorri Sturluson was a Skald as well as a Christian. It was the role of a Skald to be a historian as well as a member of court (depending on the time, region, and other contexts). It's my personal belief that, while he may have had a Christian slant on things, he may have also specifically stated some things as the history of men to preserve some of the lore (though that is pure speculation on my part).
There are instances of human men with the names of deities as their own or as part of their own name as they are more akin to titles than what we think of as given names - they may have also been used to honor said deities.
It is important to note, however, that none of the deities were ever considered to be physical humans, even there are mentions of the Gods walking among humans, such as Heimdallr or Odinn in disguise. Some people believe that the deities manifest themselves in various moments through people (such as a one-eyed vet offering advice being a moment of emulation), but it tends to stop there. Especially in the case of Ragnarok, most Heathens or otherwise Norse Pagans don't tend to believe it to be a physical end-of-days event.
One thing that tends to attract people to Heathenry, from whom I've spoken to, are that those they worship are on some level relatable in their situations, their actions, and their personalities. Those that worship Thor do so for various reasons and I am unable to speak from personal experience - though there are plenty who revere him and could tell you why they call Him their God.