Yeah, it's a ziggurat. The Mesopotamians built them.
The existence of a ziggurat, or a boat shaped rock formation, or chariot wheel in the Red Sea doesn't prove anything about the supernatural.
I can think of a lot of reasons that a chariot wheel or axle would be in the Red Sea, and none of them require the miraculous. That probably explains the looks you got from people when you asked that question.
“The existence of a ziggurat, or a boat shaped rock formation, or chariot wheel in the Red Sea doesn’t prove anything about the supernatural.”
Actually, you are correct. But shouldn’t that raise questions? Especially when they are in general locations where Biblical things took place.