The Great Commission!
"And Jesus came an spoke to them saying, 'All authority has been given Me in heaven and on earth. Go therefore and make disciples of all the nations, baptizing them in the name of the Father and of the Son and of the Holy spirit, teaching them to observe all things that I have commanded you; and lo I am with you always, even to the end of the age.' And He said to them, 'Go into all the world and preach the gospel to every creature. He who believes and i...s baptized will be saved; but he who does not believe will be condemned. And these signs will follow those who believe: In My name they will cast out demons; they will speak with new tongues; they will take up serpents; and if they drink anything deadly it will by no means hurt them; they will lay hands on the sick and they will recover.' So Jesus said to them again, 'Peace to you! As the Father has sent Me I also send you.' And when He had said this He breathed on them and said to them. 'Receive the Holy Spirit. If you forgive the sins of any they are forgiven them; if you retain the sins of any they are retained.' And being assembled together with Him, He commanded them not to depart from Jerusalem, but ot wait for the Promise of the Father, 'which', He said, 'you have heard from Me; for John truly baptized with water, but you shall be baptized with the Holy Spirit not many days from now.' Therefore, when they had come together they asked Him saying, 'LORD, will You at this time restore the Kingdom of Israel?' And He said to them, 'It is not for you to know the times or seasons which the Father has put in His own authority. But you shall receive power when the Holy Spirit has come upon you; and you shall be witnesses to Me in Jerusalem, and in all Judea and Samaria, and to the end of the earth."
Matthew 28:18-20; Mark 16:14-18; John 20:21-23; Acts 1:4-8.
So what happened that we are not doing this in the Church today?