Diacritic marks did not exist at time of Uthman and students of quran debated over the reading. Over 37 qira'at qurans were made and existed by late 9th century.
Islam grew out of an environment of demonic infestation but has no response to it at all, as can be evidenced by the 7th century examples of the caliphs Muawiya, Abd al Malik and even the governor al Hajjaj, who instead of going to their own religious leaders, came to Christians to be healed, and particularly to be healed of demonization.