Archangel (Samaria, Book 1)

Set in a society founded as an egalitarian utopia but now tainted with vices and inequity, Sharon Shinn's love story is plotty and calamitous. Rachel and Gabriel have nothing in common beyond wishing that the god Jovah had ordained they wed other people, yet they must cooperate in singing a mass to the god on the occasion of Gabriel's elevation to Archangel. Upright Gabriel has enemies among both mortal and angelic peoples who prefer to risk world destruction over his restoration of the old order.