Our Prophet salla Allahu alaihi wa sallam has died and was washed like all dead people and the companions prayed the funeral prayer and then he was buried. Is he alive like us? The answer is surely no. otherwise, we would get him out of the grave to live with us. However, he is alive in the stage of Barzakh which is a transitional stage between this life and the hereafter. Those who believe that he is alive like us are misguided and most probably are following the Sufi sect.