The Apostle Paul writes the following in Romans 15:18-19

18 For I will not presume to speak of anything except what Christ has accomplished through me, resulting in the obedience of the Gentiles by word and deed, 19 in the power of signs and wonders, in the power of the Spirit; so that from Jerusalem and all around as far as Illyricum I have fully preached the gospel of Christ. 

At Pentecost when the Spirit spoke to the devout Jews from every nation in Acts 2 He said:

11 "...we hear them speaking in our own tongues of the mighty deeds of God.”

God's work that men are called to belive in to be reconciled with God is His work in and through Christ.

II Corinthians 5:19 says, "...God was in Christ reconciling the world to Himself..."

The Scriptures are straight forward that for man to be reconciled to God they must believe on the Lord Jesus Christ.  So preach Christ clearly so they can hear and Lord willing repent and believe on Him and be reconciled to God.