The scene is detailed and I like the hook at the end.
However, some of the grammar seems slightly wrong to me. For example:
"...as winged beasts leered and grimaced from their perches, skulls grinned from on-high, and volt-powered screens unscroll messages of faith to tens of scores of thousands...."
The tense of the last verb does not match the rest: it would work better if they were either all present or all past.