Imagine there’s no heaven
It’s easy if you try
No hell below us
Above us only sky
Imagine all the people
Living for today
Imagine there’s no countries
It isn’t hard to do
Nothing to kill or die for
No religion too
Imagine all the people
Living life in peace
You may say I’m a dreamer
But I’m not the only one
I hope someday you’ll join us
And the world will be as one
Imagine no possessions
I wonder if you can
No need for greed or hunger
A brotherhood of man
Imagine all the people
Sharing all the world
You may say I’m a dreamer
But I’m not the only one
I hope someday you’ll join us
And the world will live as one
– John Lennon
Knowledge Guild 
[John Lennon] ‘If you can imagine a world at peace, with no denominations of religion—not without religion but without this my God-is-bigger-than-your-God thing—then it can be true […] the World Church called me once and asked, “Can we use the lyrics to ‘Imagine’ and just change it to ‘Imagine one religion’?” That showed [me] they didn’t understand it at all. It would defeat the whole purpose of the song, the whole idea.’
– Sheff, David (1981). Golson, G. Barry, ed. All We Are Saying: The Last Major Interview with John Lennon and Yoko Ono (2000 ed.). St Martin’s Griffin. p. 212–13
One religion would be great – if it was backed by incontrovertible evidence and had a plausible god in place of the vain, selfish, cruel, illogical and arrogant monster that most depict god to be.