I am convinced that christians constantly talk in jargon, and then when asked to explain, they use more jargon to elaborate on the jargon you didn't understand previously.
If you really understand something you can explain it to your granny.
The Greek doesn't even say "born again" at John 3 it says "born from above". Born again is not found in the bible.
How can christians recommend their faith to others until they first understand it?