For some reason, I tend to agree with you and would add this.
Nicodemus was a good man, and the scriptures bear witness to this. I find it interesting that Nicodemus was considered what we now call a Rabbi and he was having this theological conversation with Jesus, also considered a Rabbi at that time.
What I find interesting is this.... John 3: 12 I have spoken to you of earthly things and you do not believe; how then will you believe if I speak of heavenly things?
It seems to me that to understand spiritual things, one should probably have a Godly view of the earthly things, aka the Kingdom of God.
I believe my testimony, as with many others attest to Gods Kingdom and if folks can see what God is able to do in our lives, they have an opportunity for a spiritual rebirth of their own.
P.S. Jesus performed many miracles so that people would see, and believe. Today, they can look into our lives and see, as to believe that God is still active and transforming / saving lives.