Responses to this have come from Rob Bowman (Evangelical), Mollie Hemmingway (Lutheran), Carl Olson (Catholic), and Al Mohler (Southern Baptist). They are all very good, though Bowman's is the best of the lot. Here's an excerpt from his piece:
When Miller does give attention to the context in which biblical statements appear, her use of context is similarly selective and tendentious. In fairness, her argument here is not only unoriginal, it is ubiquitous (like the argument from Jesus’ silence) in polemics defending same-sex unions. It is the stock “Leviticus? You can’t be serious” argument:Twice Leviticus refers to sex between men as “an abomination” (King James version), but these are throwaway lines in a peculiar text given over to codes for living in the ancient Jewish world, a text that devotes verse after verse to treatments for leprosy, cleanliness rituals for menstruating women and the correct way to sacrifice a goat—or a lamb or a turtle dove. Most of us no longer heed Leviticus on haircuts or blood sacrifices; our modern understanding of the world has surpassed its prescriptions. Why would we regard its condemnation of homosexuality with more seriousness than we regard its advice, which is far lengthier, on the best price to pay for a slave?
Well, then, while we’re tossing out Leviticus because it gives so much attention to matters of ritual, let’s be sure to toss out all of it. In the very chapters condemning homosexual acts (in 18:22 and 20:13), Leviticus also condemns incest (18:6-18; 20:11-12, 14, 17, 19-21), adultery (18:20; 20:10), child-sacrifice (18:21; 20:2-5), and bestiality (18:23; 20:15-16). The texts condemning homosexual acts are sandwiched immediately between texts condemning child-sacrifice and bestiality in chapter 18 (18:21-23) and between texts condemning different types of incest in chapter 20 (20:12-14).
In the intervening chapter, Leviticus contains what used to be its most famous injunction: “you shall love your neighbor as yourself” (19:18), quoted by Jesus as the second of the two greatest commandments (Matt. 22:39; Mark 12:31, 33; cf. Luke 10:27). Leviticus 19 also commands the Israelites to respect their parents (19:3) and leave something in their fields for the poor to eat (19:9-10). They are not to steal, deceive, or lie to one another (19:11), oppress their neighbors (19:13), mistreat those with physical impairments (19:14), show partiality in judgment to the rich (19:15), spread slander or put other people’s lives in jeopardy (19:16), hate their brothers, or take revenge or bear grudges against others (19:17-18). The Israelites are not to degrade their daughters by making them prostitutes (19:29). They are to show honor to the elderly (19:32) and love foreigners like kin (19:33-34). They are to use honest weights and measures to avoid defrauding others (19:35-36).