I am often asked, "If everyone is going to be reconciled to God eventually, why bother with evangelism?"
Let me offer an answer within the context of God's sovereign choices.
God is the Designer, Creator and Ruler of the universe. As such, He made and makes all the decisions involved in its creation, maintenance and affairs.
Unless He chooses to delegate some decisions to us, he makes all the choices - and even the choice to delegate is His.
Here are some examples of God's choices.
God chose to create the heavens and the earth.
God chose to commence the human race with a man, Adam, made in his image, and a woman, Eve, made from that man.
God chose Noah, the ark-builder, to save 8 people from the global flood.
God chose Abraham to become the father of a new spiritual race.
God chose Jacob to be the father of God's special nation, called Israel.
God chose Joseph to save Israel from starvation.
God chose Moses to free Israel from Egypt.
God chose David to be the greatest of the kings of Israel.
God chose Solomon to build a most elaborately adorned temple in Jerusalem.
God chose Jesus to be the Saviour of the world and Jesus chose to draw all people to himself.
Those last choices involving Jesus were to guarantee that God's ultimate choice that all creation would spend eternity in unity and harmony with Himself would be achieved. (Ephesians 1 : 7 ff)
However, some of His creation are chosen earlier than others, and for a special purpose.
These early-chosen are given belief (faith) and are called believers, disciples, first fruits or the Body Of Christ.
And what do they believe?
According to St Paul, they believe the good news "that Christ died for our sins according to the Scriptures, that he was buried, that he was raised on the third day according to the Scriptures." (1 Corinthians 15 : 3 - 4)
And what is their special purpose?
The task of the Body of Christ is to announce this good news - the gospel - to the world: that God has reconciled the world to Himself. (2 Corinthians 5 : 18 - 19).
And what happens when they do?
Many people will hear this good news and those who have been chosen to join the Body of Christ, to become an early-believer, will be given belief (faith) and will join in this ministry (Acts 13 : 48}.
This process will continue until all those who have been chosen to be early believers have heard the gospel and been given faith.
At this point, the body of Christ will be complete and the events due to be unfolded at the consummation of the ages will commence - the salvation of Israel (Romans 11 : 25 ff) and the commencement of the millennium kingdom (Revelation 20 : 1 ff), for example.
So what is the purpose of evangelism, of announcing the gospel?
It is to complete the Body of Christ, those chosen before the creation of the world (Ephesians 1 : 3 ff) to show the incomparable riches of God's grace in the heavenly realms in the coming ages. (Ephesians 2 : 6 - 7)
We are blessed to have been chosen early, but we also have a major responsibility - to preach the gospel so that God can give faith to the not-yet members of the Body of Christ. (Romans 10 : 17). We usually call this activity or ministry evangelism.