Amenhotep IV was not born to be a heretical pharaoh. He was actually not born to be pharaoh at all, but once the position became his, he was willing do whatever it took to protect the position of pharaoh for generations to come.
Statue of King Akhenaten, New Kingdom, 18th Dynasty. Akhenaten (/ˌækəˈnɑːtən/; also spelled Echnaton, Akhenaton, Ikhnaton, and Khuenaten; meaning "Effective for Aten") known before the fifth year of his reign as Amenhotep IV (Greek, Amenophis IV, meaning "Amun is Satisfied"). He ruled for 17 years & died perhaps 1336BC-1334BC. He is noted for abandoning traditional Egyptian polytheism and introducing worship centered on the Aten, which is sometimes described as monotheistic or henotheistic.