well friend read the history properly and also compare things with both religion of islam and hinduism. if u compare the religions mohammed just followed Hinduism i am not just saying for the heck of it.
1. In mecca people circle the stone as in Hinduism do. 2. the stone is believed to be Shiva's ling 3. there is pilgrimage like Hindu do that in ones lifetime Muslims have to go to mecca 4. Hindus take a holy dip in water people in mecca do the same or drink the holy water
5. the stone has been covered bcaus it is believe that if it exposed the religion is gone thats why for centuries it has been hidden