Do you not understand?

"I tell you the truth, we speak of what we know, and we testify to what we have seen, but still you people do not accept our testimony. I have spoken to you of earthly things and you do not believe; how then will you believe if I speak of heavenly things?
No one has ever gone into heaven except the one who came from heaven—the Son of Man. Just as Moses lifted up the snake in the desert, so the Son of Man must be lifted up, that everyone who believes in him may have eternal life."
^{(John 3:11-15)}

The snake in the desert!
(Numbers 21:4-9)
The Israelites murmured against God.
God sent poisonous snakes into their camp.
God told Moses to make a bronze snake and lift it up on a pole.
Is the people looked at the bronze snake they did not die.

You decide!

Did Nicodemus become a believer?