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They might be sir, but there are also some other theories floating around like sacred burial site or a healing place or used for astronomical calculations.... :)

also theories floating around about miscengenation between unicorns and leprachauns..they danced on the stones in the pale moonlight...

Hahaha, ROFL, never heard of that one Sir..... :D

the point that I'm attempting to make is that we don't even know to any great degree, how OLD the 'rings' are...we have absolutely ZERO clue as to what they were used for.
Don't let anyone else tell you other wise.
Your guess (and it will BE a guess) is just as good as anyones.
(points for creativity...'religious rituals' are SO last century)