https://en.wikipedia.org/wiki/And_did_those_feet_in_ancient_time

Blake’s poem

And did those feet in ancient time,
Walk upon England’s mountains green:
And was the holy Lamb of God,
On Englands pleasant pastures seen!

And did the Countenance Divine,
Shine forth upon our clouded hills?
And was Jerusalem builded here,
Among these dark Satanic Mills?

Bring me my Bow of burning gold;
Bring me my Arrows of desire:
Bring me my Spear: O clouds unfold!
Bring me my Chariot of fire!

I will not cease from Mental Fight,
Nor shall my Sword sleep in my hand:
Till we have built Jerusalem,
In England’s green & pleasant Land.

Okay, that clearly is not about the literal city of Jerusalem itself.

I don’t see why this is controversial.