Artificial Demon Seraph Genesis

16 year old Christian Aureus Von Kreis finds out that he is a biological monstrosity he soon hears a voice inside his head he follows its instructions and saves a black eagle and loses consciousness when he wakes up he is told that God wants to see if he can reach the highest rank any angel can achieve he blatantly accepts but is unaware that there's another side of him that does not like God at all.