Of course his personal relationship with God was responsible, but so was the personal relationship of many others. This was a spontaneous outpouring of the Holy Spirit on people who, on that day and in that place, were ready for it. Magic is abstracted. Miracle is specific to time, space, and situation. Magic relates to the personal power of one.
Miracle relates to the collective power of the holy spirit.
Magic deals with power and control. Miracle deals with love, fulfillment, and transformation. Here is the most miraculous, the most remarkable, thing about the miracles of Jesus as opposed to the work of the magician. You can feel the love on that hillside. It was an incredible day.