Eternal War: Shadows of Light

The story of Eternal War is centred around a deeply troubled teenager called John Coronado, who is nearly driven to suicide by his inner "personal hell". John calls to God to save him, and the game's protagonist called Mike, endowed with holy powers, is sent into John's mind to purify it from inner demons and save the youth's life. It is implied in the intro that Mike is an angel, but not stated outright. The game manual simply calls him a friend.