Self Sai Spirituality Science

In search of Who am I.. I reached to a point where I know now that this world is illusion but, WHO created this illusion and WHY created it, are still my pending questions. For me my Shirdi Sai, path of Spirituality, all sciences and Self are One. Infact one yields from other. I started with Science went to Spirituality reached my Sai who i believe will help me realize Self..