Costi Hinn worked in the ministry of his uncle Benny Hinn, an internationally-known “televangelist” who claims to have the power of healing and miracles. Investigations about staged healings and extravagant use of donor funds have dogged Benny Hinn for years.

Costi was saved by God’s grace. While careful not to broad brush all charismatics, he is warning of the miracle-healing movements and how they are impacting the Evangelical church...