Hardly. I don't endorse anything suggested in the song. But I am not bent out of shape by merely being asked to imagine them. What are you so afraid of?
Yes, I am agnostic. I do not believe in organized religion so its not too much of a stretch for me to imagine a religion-free world. But thats as far as it goes. I do not expect anyone to see things as I do nor do I care a fig if people want to worship whatever god they choose (or none) as long as they harm no one and don't try to shove it down my throat.
(Before I get flamed too much here, I should add that the athiest @ssholes who are out there doing things like trying to have the word "god" removed from our PoA or make sure that no one reads the 10 commandments in a public place make me sick.)
What I am so afraid of is people like Stalin, Mao and Hitler who kill millions in the name of achieving the Utopian vision John Lennon sets before us in Imagine . . . large chunks of gullible humanity have bought into these lies before and it can happen again . . . a song like Imagine helps to subtly set the stage for slaughter . . .
Now why are you going around setting up artificial barriers to other people's freedom? Why should their freedom magically stop when they want to shove it down your throat? There's no G-d (according to you) to make this objectively wrong. If objective right and wrong do not exist, then neither is it wrong to violate your "rights."
No wonder you so enjoy that song. Both of you are riddled with internal inconsistencies.