[quote=Zeropathic]
What became of Sodom and Gomorrah? The people, I mean, not the cities.
[/quote]

After the two cities were purged, the vast majority of the people living there were turned into the horrible abominations that now roam the ruins, mindlessly devouring each other. However, the greatest sinners and warlords were simply put in chains in the Prisons beneath the cities. Telling you why exactly would be kind of a spoiler.

[quote=Zeropathic]
How advanced is out metallurgy? Azazel taught us to work the metals of the earth, but are we working bronze, iron, or steel? Bronze seems to me more "proper" for the time period, but since we're taught by angels in a fantasy setting, I suppose historical accuracy might not be that important.[/quote]

I'd say that steel might be a little too advanced. Bronze and iron are fine.

[quote=Zeropathic]
How much time passed between angels banging the daughters of men and the purge of the two cities?[/quote]

Around a hundred years.

[quote=Zeropathic]
How long have we the characters been imprisoned at the start of the RP?[/quote]

A decade? Fifty years? A century? A millennia? All of eternity? Who knows?

[quote=Zeropathic]
How would warlords go about making a giant fight for them, potentially against other giants? They seem like an unruly bunch to me. Kidnap their mothers and threaten them? Sweet-talk their dad? Does the angel pact come with a free giant? And are they really three kilometers tall? That's pretty tall. Which kind of ell are we operating with?[/quote]

Giants are big and strong, but also very very stupid. Think about war elephants or LotR mumaks, but bigger. Some warlords even built entire castles on the hunched backs of their giants. An angel pact does not come with a free giant, that'd be too easy. About the size, you know how much authors like to exaggerate things. 

[quote=Zeropathic] I have one more question: how do we go about making pacts with the angels? Do they seek out humans, or do we summon them? [/quote]

Those who seek to enter a covenant with a fallen angel must perform a ritual to do so, but you don't "summon" it in a physical sense. Details of the ritual may vary, but the gist of it is that you offer your eternal devotion in exchange for powers.