Early religion

It is believed religion started with the Neanderthals placing grave-goods in their graves. They have found a pair of deer antlers that they think was worn by a shaman or priest. That was Cromagnon though.Cave paintings show mysterious images of the hunt and a deer-like figure with horns that could be religious. Could the figure be connected with the pair of horns and also be a early depiction of the Celtic god Cernunnos?