The word is spread by men, yes. That doesn’t mean Jesus was inclusive of all species of man. At the end of the day, faith is a gift given by god. That’s repeatedly said. Many people think they can convince people to believe, but in reality you can’t convince people to believe in a god they don’t believe in any more than you can convince people to believe their car is a different color than it is. Either god grants them faith, or he doesn’t