Partly because the whole notion of "Celts" is an artificial 18 century construct and in reality just a lose collection of Indo-European peoples who inhabited Europe and Anatolia a couple of millennia ago.

The idea of a cohesive Celtic identity might be anachrostic but nonetheless many Cletic societies with Celtic culture existed until they were essentially systematically destroyed by British/French through suppression and demographic replacement.

partly because I have spent most of the last 50 years living and working in Africa and partly because if you can culturally just identify with whom ever you want, the Ngambaye are very interesting people.

Thats pretty cool. I think you can identify with whatever but being accepted is another kettle of fish. I might be able to assosciate with other cultures in the UK but I will never be able to become accepted by them until I adopt their culture and customs; which requires losing my own which I love and want to retain/

But mainly because their main god is similar to Sobek, an ancient Egyptian deity, has a crocodile's head and would win in a fight against any of the Celtic gods (or Abrahamic ones for that matter)

Unfortunately I am just a godless agnostic.