Nicodemai All Over The Place

Once again, my wordage needs explanosity:
"Nicodemai" would be the plural of "Nicodemus" the teacher of Israel whom Jesus took to school in John chapter 3.
The smart religious fella who thought that his ticket to Heaven was paid.
The one confused when Jesus said, “Truly, truly, I say to you, unless one is born again he cannot see the kingdom of God.”
Recently had a conversation-just kidding~we were talking past each other instead of conversing-regarding the Big Q: "WHO is Born again?"
One of us suggested that there are some Born again Christians in every denom including the Catholic one.
T'other say 'Nay', that those whom God has chosen to be Born again will leave dead, heretical churches.
God will lead them to churches where the majority of faithful ARE born again.
This non-Conversation sent me on a journey where I found that:
A: Catholics believe they are Born again because they have the Mass and each time they Mass they repent of their sins, ask forgiveness and since they have already been baptized, they can yell Bingo! with a filled card.
B: A Lutheran denom admitted that they were the Born again ones, not like those OTHER Lutherans who co-habitate with Methodists and Catholics and Mormons. No Sir!~they are THE Good Born Again Lutherans.
I think that Christ was very clear in John chapter 3.
^"5Jesus answered, “Truly, truly, I say to you, unless one is born of water and the Spirit he cannot enter into the kingdom of God. 
⁶“That which is born of the flesh is flesh, and that which is born of the Spirit is spirit."
No church can declare a person Born Again.
God calls All to Repentance, but only those whom God has chosen will respond to that Call.
No Call?
No repent?
Not Born again.