Have a look. If humans can reproduce the technicality and precision of these with a board and string, I'm in the wrong field, pun intended.
http://www.cropcircleconnector.com/interface2005.htm
I've continued to stay agnostic. The bible stuff that gets pushed is only to keep the religious people at bay. Prayers are pure manifestation of your thoughts. Prayer is just a word that's been lumped in with religion to the point people dont understand what manifesting actually is.
This subject gets deep. What other way could they make contact that would be able to bypass a cabal blockade? I just play devils advocate. I get the crops angle, but I really do not think theyd care about something that can be regrown. Free will comes into play too, as to why they dont make contact.