Lyric discussion by detachment2702 

Cover art for Jerusalem lyrics by Emerson, Lake & Palmer

The speaker starts out by asking the questions of whether Jesus ever set foot in England, whether Jerusalem was built there, etc. To which the obvious answer is no. Then the speaker goes on request battle gear and declares that he will fight "Till we have built Jerusalem in England's green and pleasant land".

This is clearly a criticism of those who kill in the name of Christianity as though it is some exclusive club to which Englanders can only be members, even though those same people are not his 'chosen people' either.