Sorry, none are ones I am familiar with.
Well thank you. I always strive to "open up New Frontiers"... :)
Unfortunetely, I don't consider anything I've written to be a form of "belief-system", so I don't know if I still qualify for your honor and praise..
(Oh, by the way, if humans today are unable -- in your opinion -- to make such formations, then please inform us how humans from the past could accomplish such feats.)
Ever consider the possibility that we aren't the first technologically advanced civilization to inhabit the Earth? In fact, we might very well be quite primitive in relation to those before us, who through some type of planetary cataclysism were virtually anhililated. In fact, IF there were such a civilization and foresaw such a catastrophic event, and IF they had mastered the knowledge of travel through space and/or time, don't you think they'd do something about leaving where they were and settle somewhere else?
What if WE ourselves are descended from those who inhabited some other world such as that which now makes up the Asteroid belt, and came here to escape such a disaster? Our ancestors may have been virtually wiped out due to disease or natural disaster, and lost most of what knowledge they had. There might be OTHER descendents who escaped to OTHER worlds in space and time, and have located US and are trying to jog our ancestorial memory via the symbolism displayed in so-called crop circles. It's just a thought, and one of an endless list of possibilities if you have an open mind and do in fact consider things possible that are currently impossible due to our limited understanding of the Universe.
Sorry, none are ones I am familiar with.