He once served the devil, now he kills for God--The Underrated Epic Movie Solomon Kane

Solomon Kane was a seventeenth-century English mercenary who had been cold-blooded and murderous. During an expedition to Africa, he encountered demons and was told that his soul was doomed to hell. Horrified, he renounces violence and converts to Christianity, hoping to save his soul by repenting and atoning for his sins. When he returns to England, however, his homeland has been ravaged by the forces of evil and a cult controls the entire country. In order to save innocent people and face the sin within himself, he is forced to take up arms once again and embark on a path of redemption through blood and fire.