It is useful to know that God’s grace teaches people how to depart from ungodliness. Without this teaching a person will not learn how to behave in a Godly manner.
His grace can be seen by all people, however it is not given to everyone who can see it, Titus 2:11-12.
God’s grace is not “unmerited”. It is not possible for something to be unmerited if you have to do something to obtain it. Grace is given to those who humble themselves before God, James 4:6. This produces an intentional rivalry between Christians and non-Christians. One group knows how to be/act Godly and the other group does not know how.
Remember Cain killed Abel because He saw that Able was capable of pleasing God.