It's easy if you try
No hell below us
Above us only sky
https://www.google.com/search?client=firefox-b-1-d&q=imagine+john+lennon+lyrics
Yes, John Lennon was an atheist.
And yes, few have ever bothered to contend with the truth of his statement.
What a piece of crap that song is.
And? The Church has become a purveyor of socialist constructs instead of a preacher of Jesus...and living under the New Covenant is meant for folks who believe and who have accepted the Gift of Jesus to live the way Lennon envisioned (Where there is love, there is no harm...and that fulfills the intent of [fill in the blank])....way too many of the Christian community have fallen from Grace by deciding they had to be holier than the next guy, and make it clear as Hell, in order to save their “special place”.