Let’s see what the word of God has to say about his departure.
1 John 2:19
“They went out from us, but they were not of us; for if they had been of us, they would no doubt have continued with us: but they went out, that they might be made manifest that they were not all of us.”
He was never truly “born-again” according to the word of God.
Where do you find in Sacred Scripture that Scott Hahn "was never truly born-again"?
Catholics are born again when they are baptized by water and the spirit.
Where are you getting the misinformation that he was never “born-again?”
“Unless you eat my body and drink my blood you shall not enter the kingdom of heaven.” from the book of John.
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I don't think John was talking about Dr. Hahn there. It seems like it could be applied much more aptly to those disciples who rejected Jesus direct teaching that they should eat His body and drink His blood. (John 6:53-58)
Then it (Gospel of John) says:
Many therefore of His disciples, when they had heard this, said, "This is a hard saying; who can hear it?" (John 6:60)
From that time, many of His disciples went back, and walked no more with Him. (John 6:66)