Kind of side steps the topic, the idea was to have a think and come up with an idea of how we would keep track of the years if history had happened with no religion or god’s, to be a bit inventive of what possible world this would give rise to and so on.
How ever insightful, and you do make some good points, they are written as if we just remove the Christian faiths and run from there.
If we re un history san religion of any kind then the Jewish calendar wouldn’t be the same, and in the same vain you can’t assume any currently excepted system or infrastructure to be in place.
So suggesting some thing that ties in with our current year system is pointless in this little thought experiment as in our imaginary world it wouldn’t be 2005. and that is the underlying premise of this little game.
I would lay money on more systems like the traditional Japanese way of doing things, Counting the years of each emperor, but as this hypothetical world has never had the concept of the divine you cant count on this system working because in our world the emperor was seen as divine. In our imaginary secular world that would never have been thought of, So with out the deification of kings and such would they have held the same power?
As I said in my OP the best way would be to base zero on full planetary alignments, all of them in a line on one side of the sun. Apparently it is thought by some that they happen ever 6k years and the last one was in 2000, so as the previous one would have been seen as the starting point we could say this is the fifth year of the first division of the second progression. the fifth of the first of the second.