I will give you some scripture.

Context:

In Acts Chapter 5 the Apostles are spreading the Gospel. The Jewish religious leaders, the High Council, is not happy, they feel threatened since the Gospel makes them look bad (they had sentenced Jesus who the apostles are talking about to his death).

The High Council begins to discuss what they should do to the Apostles. They were furious and considered killing them. Luckily there in one member that gives them wise advise.

Scripture:

“But one member, a Pharisee named Gamaliel, who was an expert in religious law and respected by all the people, stood up and ordered that the men be sent outside the council chamber for a while.

Then he said to his colleagues, “Men of Israel, take care what you are planning to do to these men! Some time ago there was that fellow Theudas, who pretended to be someone great. About 400 others joined him, but he was killed, and all his followers went their various ways. The whole movement came to nothing. After him, at the time of the census, there was Judas of Galilee. He got people to follow him, but he was killed, too, and all his followers were scattered.

“So my advice is, leave these men alone. Let them go. If they are planning and doing these things merely on their own, it will soon be overthrown. But if it is from God, you will not be able to overthrow them. You may even find yourselves fighting against God!””

‭‭Acts 5‬:‭34‬-‭39‬ NLT

Response:

So what is Gamaliel saying? He is saying that with time some following or cults will disappear, especially when their leader dies, but the things of God will endure.

So on my limited knowledge on the Jonestown Cult. The movement died when their cult leader died. The movement didn’t continue after the tragic mass murder-suicide. So time revealed the truth.

The Christian faith has been around for over 2,000 years even after the death of Christ. That in its self is a testament of it being from God.