Responses
Maybe try "Crush and Burn" is still not yet completed tho..
Baraou No Souretsu ! Honestly, it's more historical than religious, but for that reason, it gives the vibes. And also the character has that thing of believing he's allied with the devil. A lot of moral doubt! Super interesting story
Not interested in pro-theist manga/manga actively promoting religion, just manga featuring a religious character or religious themes ^^