I have to remind the Shankaracharya, for whom, I have the greatest regard as one of the foremost leaders of Hinduism, that the 5th to 9th Avatars of Bhagavan Vishnu – Vamana, Parshuram, Ram, Krishna and Buddha, were also in human form.
Each of these Dashavataras manifested on Earth to teach humankind a lesson and trigger off a bend in human consciousness. Likewise, the Hindu religion is replete with examples of various other deities taking human form, to deliver a message to humankind and aid in it evolution.
Shri Krishna said in the Gita that all worship reaches me, even those who worship other deities, with devotion and sincerity, worship me. At those who question and cast aspirations on Sai Baba please ponder on one the most popular phrases used by Sai Baba “Sabka Malik Ek”, this is the teaching which unites and not divides.