1 Corinthians 14:24-25 But if an unbeliever or an inquirer comes in while everyone is prophesying, they are convicted of sin and are brought under judgment by all, as the secrets of their hearts are laid bare. So they will fall down and worship God, exclaiming, “God is really among you!” 

Unbelievers can find God in the actions of the people in a church. And, as a result, their emotional walls will break down and they will worship the one true God.