Why do,you think no other bibllical religions teach this promise?
In fact the theme of "Paradise Lost" and "Paradise Regained" is a common
belief and the jw's are in no way unique or the inventors of this doctrine.
Dante wrote an Epic Poem about it, Hieronymus Bosh (15th century)
did paintings about it, as did Jan the Elder Bruegal (16th century)
and Lucass the Elder Cranach (16th cent )
The Persians also depicted Paradise on Earth.
The Apocalypse of Ezra, a book in Jewish Pseudepigrapha,
portrays paradise in this way:
“For you Paradise is open, the Tree of Life planted, the future age and abundance
are prepared, rest appointed, good words established, and wisdom defined.
Evil roots are sealed up from you, and sickness extinguished from your path.
Death is concealed; Hades fled; corruption sinks in oblivion; sorrow is gone,
and in the end the gold of immortality is manifest” (The Apocalypse of Ezra, 8:52).
Since paradise has been understood as a peaceful, delightful,
and blissful place where people can live eternally without pain and death,
it is no doubt that most people desire to go to there.
The Quakers and early pilgrims depicted an Isaiah like future
where the "wolf lies down with the lamb". Many 16th and 17th paintings about it.
Again - Jehovah's Witnesses persist in their need to be "special" and have
"special knowledge" There IS no "special knowledge" Its just that JW;s are isolated
and limited in their world view by the teachings of the WT that warns them not
to get educated or read "apostate" literature or the teachings of other churches.