Earlier quoted context omitted.
Sorry, were you somehow under the impression that the people of Sodom, Lot, and his daughters are being held up as models we should all be emulating? I always find it a bit strange that people despise simplistic "Sunday-school" answers to life, but then when they read the Bible and find messy situations like the one described above, they say, "What kind messed up story is this?" Real life is sometimes messed up. A bo…
If you read the old testament, it's brutal and often barbaric. It's written in bronze age and relfects life of the time. To argue that it reflects morals or 'messed up' situatuons we'd consider in civilised society is to be delusional.
Secondly, the claim was that Christianity -- that is, the teaching of Jesus -- has affected European ideas about morality. Lot is further away from Jesus than Jesus is from us.
I think the person you responded to has an inaccurate view of the history of slavery in Europe. But only someone who has never experienced a different culture could say that Christianity has had no effect on the moral ideas of the West.