Dear Gino:
Oh my - there are 23 Question marks in your post.
I noticed on the YouTube channel and in Wikipedia that many people and denominations use the "Born Again Christian" terminology. I think that the reason no one seems to use the "New Creature" terminology is because they don't really understand dispensations as used by God in His Holy Word.
Paul is our Apostle and pattern but that fact, directly from the Bible, is largely ignored by both the saved and unsaved Christians. As a member of the Body of Christ I really prefer to think of us as a "New Creature". And it appears that so too Paul, who was directly taught by Jesus, not after the flesh.
I am not so sure Adam, Seth and Enos are part of the Dispensation of Grace however.
Shawn has an interesting write-up regarding the Dispensations:
Blessings,Mike