Yes, it could be interpreted that way and indeed it has been adopted as a hymn by the Christians.
But there always been a strong belief that Blake was being satirical....pointing out the harsh realities people lived under whilst the gentry worshipped God in cloistered elegance.
Blake was not a practicing member of any religious denomination though most biographers opine that he did believe in God.
And the song certainly wasn't written as a hymn.....it was a poem which was used as a preface to a book Blake wrote about his great inspiration, the Civil War era poet, John Milton. It was set to music a century later by Hubert Parry and Elgar's arrangement became the classic version we are familiar with today.
Milton himself was a man whose major work was about the very darkest side of Christian beliefs.....the Fall of Lucifer the Archangel and the story of Eve and the Forbidden Fruit which saw her and Adam run out of Eden
Blake's politics were a version of Georgian/Regency socialism and even high ranking COE prelates have often queried its bona fides as a Hymn.
That said, irrespective of what Blake meant it to be, I find it a great song and always belt it out when played if I am in church
And IMO would make a great anthem for English sporting teams.
