I didn't consider that you can win the game with more than 20 votes before round four to get 'Faith Rules the Hearts of Men'. It seems that a lot of players are better at the game than I am!
So I changed the achievement so you can get it in any round as long as the difficulty mode is on hard and you win with 20 or more votes.
Thanks to the players who pointed this out.
Posted by the game’s developer or publisher to its Steam community hub and published by Valve through Steam’s public news API. Sifter reproduces it unedited and writes none of it.