That the black stone can take away sins, is an absurd story, which is as absurd as the claim that Jesus takes away sins. Jesus is not on record for saying that he takes away sins.Please explain how the kaba stone which fell from heaven can take away sins. But when we christian claim that Jesus Christ takes away sins, you reject him for a lifeless stone which you claim takes away sin.
We do not believe that. This was clarified in Qur'aan that no soul shall carry the burdens of others or another.