The decision to avoid going into the family business can be a wise one, especially if that business involves the questionable practice of psychic healing. However, if that choice also means surrendering not only the family name, but one’s entire identity, then scamming the sick and elderly might seem to hold merit. Such is a young man’s quandary in Felix Starro, the sincere and split-focus new musical by Jessica Hagedorn and Fabian Obispo that opens the Ma-Yi Theater Company’s 30th anniversary season. Under the direction of Ralph B. Peña, this nearly two-hour dive into the meaning of faith is the first musical created by Filipino Americans to appear Off-Broadway.