If you think about it, there is no obvious reason to suspect that cheese comes from milk. Cheese is usually a solid. Milk is white. Cheese can be almost any colour. Milk gives you a moustache instantly.
Cheese takes years to give the same effect.
My son, for example, started eating cheese at a very early age, but it wasn't until many years later that he grow a moustache. Given this, it should be no surprise that it took humanity a long time to work out the exact origins of cheese. They were the first to successfully split milk into its component elements, curds and whey. From there, it was a small step to making history by creating the first artificial cheese in vitro . So successful was this process that artificial cheese soon totally dominated the market, and naturally-occurring cheese rapidly disappeared forever.