You don’t have to tell me or anyone in this forum that you are not joking in every message that you post. If you want to tell silly jokes, just say: “Here is a joke.” or “Here are some jokes.” And if you say something that is not a joke, but seems to be silly or doesn’t make sense, I will ask you: “Are you joking?” And all you need to do is say: “No, I am not joking. I am serious.” Will that make it easier for you?
Unfortunately, the word “people” usually means: “more than one human”. There are almost 8,000,000,000 people in the world, today. How many people do you think are adding to what Jesus finished? Which people are you talking about? Who told you about “people adding to what Jesus finished?”
I believe I know where you read about Jesus saying that he finished something. What the New Testament tells us about the last things that Jesus said when he was on the cross are well-known among Christians. We call them “The seven last words of Jesus”, which is not exactly true. That is why I like to call them: "The seven last things that Jesus said (on the cross).
One thing that he said on the cross is recorded in John 19:25-27.
Near the cross of Jesus stood his mother, his mother’s sister, Mary the wife of Clopas, and Mary Magdalene. When Jesus saw his mother there, and the disciple whom he loved standing nearby, he said to her, “Woman, here is your son,” and to the disciple, “Here is your mother.” From that time on, this disciple took her into his home.
Another thing Jesus said is recorded in Luke 23:43.
Two other men were crucified at the same time that Jesus was, one on his left and one on his right. One said to Jesus: “Jesus, remember me when you come into your kingdom.” And Jesus said to him: "I tell you the truth, today you will be with me in paradise.”
A third thing he said is recorded in Luke 23:34:
"Jesus said, “Father, forgive them, for they do not know what they are doing.”
A fourth thing he said were the words of the first verse of Psalm 22 which are: “My God, my God, why have you forsaken (= abandoned) me?” Jesus’ words on the cross" are recorded in Matthew 27:46:
"About three in the afternoon Jesus cried out in a loud voice, “Eli, Eli, lema sabachthani?” (which means “My God, my God, why have you forsaken me?”).
A fifth thing Jesus said is recorded in John 19:28.
Jesus said, “I am thirsty.”
A sixth thing he said is recorded in John 19:30.
When he had received the drink, Jesus said, “It is finished."
And a seventh thing that Jesus said is recorded in Luke 23:46.
Jesus called out with a loud voice, “Father, into your hands I commit my spirit.”
When Jesus said: “It is finished”, he was saying "I have fulfilled the promise that I was sent to fulfill. He redeemed the promise. In fact, after God the Father resurrected him in the tomb, he came out and met with others who had known him before his death.
And he said that he would soon send what his Father had promised:
[Luke 24:49] "I am going to send you what my Father has promised; but stay in the city until you have been clothed with power from on high.”
Now @riversea, tell me: What do you think “people” added after Jesus said “It is finished”. Do you think that when Jesus said “It is finished” and then died on the cross, that he is forbidden to say or do anything more after his resurrection; because if that is what you think, then I must tell you that you are mistaken.
Jesus fulfilled his task and died. God resurrected him in the tomb; Jesus stayed on earth about 40 more days and then ascended and disappeared in a cloud. Before he left earth, he told his followers:
Luke 24:44-48. "He said to them, ‘This is what I told you while I was still with you: Everything must be fulfilled that is written about me in the Law of Moses, the Prophets and the Psalms.’ Then he opened their minds so they could understand the Scriptures. He told them, ‘This is what is written: The Messiah will suffer and rise from the dead on the third day, and repentance for the forgiveness of sins will be preached in his name to all nations, beginning at Jerusalem. You are witnesses of these things.’ "
@riversea, the stuff that you think people added, is the stuff that Jesus told them to do: "Call people of all nations, beginning in Jerusalem, to repent for the forgiveness of their sins." What you have not understood is that Jesus expanded the call to repent, from a call just to Jews to a call for all nations [i.e. everybody else in the world at that time to today] to repent." You wanted inclusion? There it is: Inclusion of everybody who hears the story of Jesus’ life on earth, his death, his resurrection, and his ascension.