Whether Muhammad was a guru or not, the point is still, and has not been disputed yet, that pagan elements might be present in the religious practice of Islam.
Let me also make it clear that nowhere did I state that the stone was considered by Muhammad or anybody else to be divine.
Secondly, are we able to prove that the stone was a pagan instrument, no, not as clearly as some would state.
However, it is a fact that ancient religions did consider meotorites to be of divine origins. It is a fact also that shrines and temples were typically attached to these stones, as with the Kabah.
Thirdly, that the stone was simply meant to mark of the beginning and end of a religious practice, cannot not be proven any more than I or anyone else can prove that the stone originally was meant to possess divine nature. We are therefore left in a state of ignorance, however, we are told to accept from a later source Islam that the stone and the practice around it totally excludes ancient idolatry. I would like to get hold on some of the pre-Islamic sources to see the actual reality.
Thus the original purpose of the stone according to the early Meccaens may indeed have been divine, the very reason why the Kabah was attached to it.
Do I have the actual proof? No! However, when considering ancient mythology and religious practices something does ring a bell.
Be blessed
Kai