You seem to be hung up on what a word means, definitionally, as opposed to how it is generally used: most people, here in Scotland anyway, would use the word 'God' to refer to a supernatural agent as portrayed in religious beliefs and superstitions, where in the Christian tradition this involves claims of being able to work miracles, not stay dead, and where its characteristics comprise the 'omnis'.
That's fine as long as you don't propose that that would negate any other god. That example isn't the definition it is an example. One of many different examples.
The 'Clapton is God' thing was just a bit of enthusiastic support from his fans back in the day, and even if this would meet one of the definitions you seem so fond of, that usage of 'God' is so clearly different from the religious usage that you seem to be flogging a dead horse. Personally, I would subjectively regard the late (and very great) Joe Pass as being greatest guitar player I've ever encountered whose playing is worthy of my veneration* - but I wouldn't use the term 'God' to refer to him.
https://www.youtube.com/watch?v=p_kUJa1PueM
* respect or awe inspired by the dignity, wisdom, dedication, or talent of a person.
https://www.merriam-webster.com/dictionary/veneration
I understand the nuance of Clapton being god but you have to understand that that doesn't mean Clapton isn't a god. There are many Guitar Gods. And I understand that those aren't gods in a strictly religious sense but that doesn't matter.
You don't get it. The King reference is the best I can do. If you don't get that you won't ever get what it means to be a god.
Clapton is God. Elvis is King. Michael Jackson is the King of pop. Do you not understand that the word king doesn't mean either King of England or a flippant metaphoric or colloquial application. King means ruler of something. Saying that Elvis is King doesn't mean there is some confusion about whatever formal ceremonial nonsense has to take place to be the King of England and Elvis having participated in that, it means Elvis is the king, or King, i.e. ruler of Rock 'n roll.
So when you use the term God, Godparent etc. whether you know it or not what you mean is someone or something that is mighty / venerated.
When you use the term king you mean someone as the ruler of something.
When you use lord you mean someone having authority, usually but not always granted by another. Landlord. Lord Melbury.
God means mighty / venerated. It doesn't mean anything else. It's applied to various forms. Mighty, respected guitar player. Mighty / respected ruler. Mighty / respected fertility. Mighty / respected whatever. Clump of shite. Doesn't matter.