This is fake propaganda by Islamists. In his writings, Bernard Shaw described Islam in a 1933 letter to Rev Ensor Walters as "ferociously intolerant".
"Mahomet rose up at the risk of his life and insulted the stones (that the Arabs worshipped) shockingly, declaring that there is only one God, Allah, the glorious and the great . . . And there was to be no nonsense about toleration," Shaw wrote.
"You accepted Allah or you had your throat cut by someone who did accept him, and who went to Paradise for having sent you to Hell."