Brother Yun who said that we need to preach the Grace as gospel to bring people to Christ. Once they are connected to Christ they will receive the truth from them. We should not turn those away by preaching the truth.
… start telling them the truth about God saying that Idol worship is an abomination to him ...
Small correction first: Grace and Truth came THROUGH Jesus Christ not "to Jesus Christ". Next correction: When one thinks about this statement long enough, they will realize that you cannot separate Grace and Truth. They work together as God's character, extended to fallen man (Jesus Christ). Grace and Truth are not separate so you cannot offer them separately. One does not come before the other. Grace and Truth was God Himself in the flesh, offering Himself to men. Grace and Truth is the Person of Jesus Christ. We offer all of Jesus to men, not part of Him. How can you separate Jesus Christ and why would you want to? Grace and Truth is a Person not a theological concept.