I never liked the lyrics to the song. It basically was extolling communistic ideology during a time the U. S. S. R. was a world power. And many under the communistic regimes did not have to "imagine" what it would be like to have no religion. Even the state sponsered religion of the Russian Orthodox Church was persecuted, and many of its adherents and leaders hounded and murdered, and their churches torn down. But when the KGB infiltrated the Church and the ROC agreed to espouse communist ideology instead of Biblical truths, they were allowed to remain.
The reality of living in an atheistic society rid of religion, and "no heaven" too was and is harsh dictatorship far from what this song leads you to believe it would be like. It means the stripping of freedom of belief, expression, press, assembly, religion, speech. It means the suppression of religious liberty. It means death of untold tens of millions that occurred in the atheistic and communistic lands that espoused these ideas and put them into practice.
Perhaps, the people may imagine that ridding the earth of the idea of heaven and God, and destroying religion will bring about peace. But it will not. And it will not solve mankind's problems of natural disasters, disease, old age, death.
The Bible foretells there is a time coming when the world's rulers will indeed turn upon religion and destroy it. But far from being the Utopia communist and atheistic people falsely propagandize, it will be the worst time in human history. Living in a world that enforces atheism earthwide will be the worst type of dystopia this world has ever seen. And it is coming. And I imagine that is why God has had allowed this to be the last form of rule on earth. It will be the worst type of existence imaginable. Far from the propaganda espoused by those who "imagine" the suppression of your freedoms. They will offer no peace, and no real solutions to mankind's problems.
Now I was just watching a song this morning. And this, this is what real peace and happiness will be like: