What makes the "born-again" concept difficult for some Christians to accept or understand?

Then Eoh Mil attempts to answer the question, but his response leads people astray. He says, “What most so-called Christians have erroneously accepted in their minds is the doctrine that all new covenanted believers must be born again, accepting all English bibles ERRONEOUS interpreting and translation of John 3:3. The Greek word used in John 3:3 - “anathon” means ABOVE and not AGAIN, which is another Greek word “palin.” Is this error translating “anathon” (which means above) to “again” of NO IMPORTANCE or NOT SIGNIFICANT?” He goes on and on; I think he is an atheist.

Either way, I responded, “The Greek word anothen in John 3:3 means both 'again' and 'from above.' Scholars note that this double meaning fits the story. Nicodemus hears "again" and pictures physical rebirth. Jesus points to spiritual birth from God. Most Bible versions use "born again." Some choose "born from above." Both capture the idea. Jesus stresses a new life from the Holy Spirit. John 3:5-8 explains birth by water and Spirit. The resurrection marks inner change now. 1 Peter 1:23 speaks of rebirth through God's word. Believers gain new life today. 2 Corinthians 5:17 calls those in Christ a new creation. Old ways pass. New ways start. Colossians 1:18 names Jesus the firstborn from the dead. This shows His top rank in resurrection. He leads the way. Believers follow later with immortal bodies. Current rebirth gives spiritual life. Future resurrection brings full change—standard Christian teaching places rebirth in the present. Faith brings a new spiritual nature. Resurrection completes it. The original post ties "born again" only to resurrection. Main views see John 3 as a present transformation from God.” Amen, thanks for being a part of my growth and yours. Take care.