Skeptic's bible source http://www.skepticsannotatedbible.com/gen/19.html
This is very likely to be one of the worse chapters in the Bible.
First, Lot offered his two virgin daughters to mob and do whatever they want.
“Now behold, I have two daughters who have not had relations with man; please let me bring them out to you, and do to them whatever you like; [Verse 8]
In chapter 18, god promised not to destroy the city if there were more than 10 righteous men. Well, it seemed that god has already made up the mind to destroy the city anyway. The bible did not even bother to say whether god has checked and counted how many righteous men were there. Anyway, the city was destroyed sparing no one, not even children and infants.
Then the LORD rained on Sodom and Gomorrah brimstone and fire from the LORD out of heaven, and He overthrew those cities, and all the valley, and all the inhabitants of the cities, and what grew on the ground. [Verse 24 & 25]
Modern moral systems generally consider incest as immoral. While I do not have any moral basis to suggest, nor object, incest, the bible definitely has described a case of incest. I look forward to finding out the consequence of this incident.
Then the firstborn said to the younger, “Our father is old, and there is not a man on earth to come in to us after the manner of the earth. “Come, let us make our father drink wine, and let us lie with him that we may preserve our family through our father.” So they made their father drink wine that night, and the firstborn went in and lay with her father; and he did not know when she lay down or when she arose. On the following day, the firstborn said to the younger, “Behold, I lay last night with my father; let us make him drink wine tonight also; then you go in and lie with him, that we may preserve our family through our father.” So they made their father drink wine that night also, and the younger arose and lay with him; and he did not know when she lay down or when she arose. Thus both the daughters of Lot were with child by their father. The firstborn bore a son, and called his name Moab; he is the father of the Moabites to this day. 38 As for the younger, she also bore a son, and called his name Ben-ammi; he is the father of the sons of Ammon to this day. [verse 31 onward]