Any notable books with this premise?

[The Glyphstone]

As I recall it's more like 8 or 9 hundred years, and the brainwashing and fabricated religion was done unilaterally by a power-hungry subgroup of the command staff who set themselves up as "archangels" to rule the planet while enjoying exclusive access to the remaining high tech artifacts. The original plan was to preserve the knowledge but refrain from using high tech until after the time (with a large safety margin) it would take a Gbaba search effort to pass them by. Part of the command staff objected to this change of plans, and the ensuing conflict resulted in, among other things, the death of every "archangel" on both sides and the mentioned android being prepped in secret and set on a timer to activate when the original safety margin had passed.

Now the Personality Integrated Cybernetic Avatar (PICA) has to somehow overturn a despotic world-spanning theocracy, convince the highly devout world population to discard the religious ban on certain fundamental underpinnings of advanced technology, foster a new culture of scientific research and innovation, and guide humanity back to space. Resources: herself, a small cache of high tech hidden away for her use, and whatever allies she can find. Restrictions: Cannot simply hand out tech - facing the Gbaba will require new innovation above and beyond what she's got, and for that she has to get people used to discovering on their own; cannot use high tech too visibly without being universally branded demonic; cannot use high tech power generation on a large scale without calling down literal fire from heaven in the form of orbital kinetic bombardment from a system set up by some of the "archangels" to enforce the tech bans; must eventually disable said orbital bombardment system somehow in order to make tech advancement beyond a certain point possible.

Well, I was condensing it a bit, but yeah. That's a pretty good summary. Though you left out the bit where the 'her' is, after about 50-odd pages onward, a 'him'.


BTW: It's "Safehold", not "Safeworld" - don't want you to end up looking in the wrong place. Any decent-sized commercial bookstore will have them, though it'll take a bit of luck to find them in a used shop.