If religion had not happened at all what would the year be?

and still not adopted world-wide.The only thing that drives the acceptance of a uniform year is commerce. Otherwise we would still likely be on the seperate year systems that were in common well into the 1500s.My guess is that a uniform year would still result, again, solely for reason of commerce, but that it would be totally arbitrary and set as some accepted date unrelated to anything other than some treaty.

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Aslan is not a Tame Lion

No, they obviously varied.One interesting thing about the Gregorian calendar was that the English Nations didn't except it until much later. Check out the mystery of Washington's birthday.One other thing. Among the decisions that came out of the Council of Trent when the Gregorian system was adopted was a provision related to commerce. Since 11 days were being dropped there were provisions that said no one could be penalized because they missed a deadline that fell during the skipped days or that debt holders could charge extra interest as though those days had actually passed.

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Aslan is not a Tame Lion

Regardless there would still be a calendar, one of about the same length and likely divided into something around 30 days.My guess is that until consolidation there would be many calendars based on some unique cultural date for each. Once the consolidated calendar came about they would have to fix some standard date as day 1. To not offend anyone the most likely compromise would be an arbitraty date.The other major possibility is a calendar that is impossed by some conquering nation.

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Aslan is not a Tame Lion