Here is what inadequate faith in Jesus looks like.
A true Christian is a true disciple of Jesus. You cannot be a true Christian with the assurance of eternal life and at the same time refuse to be a true disciple of Christ.
The true disciple
Jesus knew that many people who followed him were not true disciples, but rather false disciples. Many believed in him in some sense, but not in the sense that resulted in their becoming true disciples. He knew their kind of belief fell short of being a saving faith.
John 8 tells of a group of people who began to believe in Jesus in an inadequate sense after hearing his teaching:
Jesus said, “‘He who sent me is with me. He has not left me alone, for I always do the things that are pleasing to him.’ As he was saying these things, many believed in him. So Jesus said to the Jews who had believed him, ‘If you abide in my word, you are truly my disciples, and you will know the truth, and the truth will set you free.’” (John 8:29–32, ESV)
So, Jesus knew that some of these people believed in him in a way that would not lead to abiding in his words. They might have believed true things, such as that Jesus was a prophet from God or that he was God’s son or that he truly performed miracles by the power of God. They gave assent to certain ideas about Jesus. But their faith did not rise to the level of turning their lives over to him and obeying his words. They did not believe in him as the one who had the right to mold their lives.
Only when they reached that sort of faith in Jesus would they truly become his disciples. And only then would they know the truth and be set free from sin by that truth. They had to believe in Jesus to the point of abiding in his words.
Surprise
It did not take long for Jesus to expose the inadequacy of their “belief” in him. In verse 33 they immediately objected to Jesus’s saying that they needed to be set free:
“They answered him, ‘We are offspring of Abraham and have never been enslaved to anyone. How is it that you say, “You will become free”?’” (John 8:33)
Jesus then explained that they are slaves to sin:
“Jesus answered them, ‘Truly, truly, I say to you, everyone who practices sin is a slave to sin. The slave does not remain in the house forever; the son remains forever. So if the Son sets you free, you will be free indeed.’” (John 8:34–36)
And then he jolts them with a shocking revelation:
“I know that you are offspring of Abraham; yet you seek to kill me because my word finds no place in you.” (John 8:37)
The revealer of hearts
These are the same people who moments ago were described as believing in Jesus, the same people Jesus urged to become true disciples. But now, just sentences later, he is revealing what the Father had revealed to him: that they harbored thoughts of killing Jesus. The reason they wanted to kill Jesus was, “My word finds no place in you.”
Jesus had told them they needed to abide in his words, and now he reveals they in fact have an active hostility toward his words. They will not allow his words to take root in their souls. They had some sort of belief in Jesus, but not a belief in him as an authoritative teacher whose words should be learned, believed, and obeyed. They saw Jesus as someone whose words should be sifted.
The time had come for Jesus to reveal to these “believers” the most shocking truth of all.
Who is your father?
John 8:38–44 says:
[Jesus said,] “I speak of what I have seen with my Father, and you do what you have heard from your father.”
They answered him, “Abraham is our father.”
Jesus said to them, “If you were Abraham’s children, you would be doing the works Abraham did, but now you seek to kill me, a man who has told you the truth that I heard from God. This is not what Abraham did. You are doing the works your father did.”
They said to him, “We were not born of sexual immorality. We have one Father—even God.”
Jesus said to them, “If God were your Father, you would love me, for I came from God and I am here. I came not of my own accord, but he sent me. Why do you not understand what I say? It is because you cannot bear to hear my word. You are of your father the devil, and your will is to do your father’s desires. He was a murderer from the beginning, and does not stand in the truth, because there is no truth in him. When he lies, he speaks out of his own character, for he is a liar and the father of lies.”
Jesus knew their hearts, as he knew the hearts of all (John 2:25). He knew they did not follow God and his truth, but rather Satan and his lies. They loved and preferred lies to truth. This is why they had no room for the teachings of Jesus. They would never abide in his words. They would never become true disciples. In some sense they believed in Jesus, but not in a saving sense.
Takeaway
Every one of us faces the same choice. Will we move beyond an inadequate faith to a saving faith? Belief is not enough if that belief does not include becoming a true disciple by abiding in the words of him who is the unique Son of God and the Lord of heaven and earth, who knows what is true and false, right and wrong, and who is the only way to God.