Well, whenever someone wants to bring up Leviticus 18:22 (as in the title of your post), I just ask them why they're not against eating shellfish, eating meat or dairy products together, wearing clothes of mixed fibers, or working on the Sabbath. All of those things are also "abominations" to God, but the only one Christians seem to focus on is the homosexuality thing.
Christian apologetics is the art of rolling a dog turd in sugar and selling it as a donut.