Through fiery trials / David Weber.

Enhanced descriptions from Syndetics:

With new alliances forged and old regimes fractured, Merlin--the cybernetic avatar of Earth's last survivor and immortal beacon to humanity--and the colonies of Safehold have many adventures ahead in Through Fiery Trials , the continuation of David Weber's New York Times bestselling military science fiction series

Those on the side of progressing humanity through advanced technology have finally triumphed over their oppressors. The unholy war between the small but mighty island realm of Charis and the radical, luddite Church of God's Awaiting has come to an end.

However, even though a provisional veil of peace has fallen over human colonies, the quiet will not last. For Safehold is a broken world, and as international alliances shift and Charis charges on with its precarious mission of global industrialization, the shifting plates of the new world order are bound to clash.

Yet, an uncertain future isn't the only danger Safehold faces. Long-thought buried secrets and prophetic promises come to light, proving time is a merciless warden who never forgets.

"Vast, complex, intricate, subtle, and unlaydownable....The biggest thing in science fiction since Isaac Asimov's Foundation series."--Dave Duncan on the Safehold series

Safehold Series
1. Off Armageddon Reef
2. By Schism Rent Asunder
3. By Heresies Distressed
4. A Mighty Fortress
5. How Firm A Foundation
6. Midst Toil and Tribulation
7. Like A Mighty Army
8. Hell's Foundations Quiver
9. At the Sign of Triumph
10. Through Fiery Trials