The Veingel by Jeremy James

When an ancient religious cult hunts his people to the brink of extinction, Jequon, a half-angel, half-human badass fights for the survival of his noble race. But as his enemies' holy-caust gains support from powerful officials in the U.S. government, our hero is forced to seek help from an unlikely source: a woman defined by her faith in the same God who wants him dead. Even worse, he starts to fall for her.