[Gen 14:18 NASB] 18 And Melchizedek king of Salem brought out bread and wine; now he was a priest of God Most High.
...The priest blesses Abram. God visits Abram.
[Gen 15:7, 16 NASB] 7 And He said to him, "I am the LORD who brought you out of Ur of the Chaldeans, to give you this land to possess it." ... 16 "Then in the fourth generation they will return here, for the iniquity of the Amorite is not yet complete."
...Abram has an illegitimate son by Hagai, called Ishmael. God visits Abram again..
[Gen 17:2, 7, 10 NASB] 2 "I will establish My covenant between Me and you,And I will multiply you exceedingly." ... 7 "I will establish My covenant between Me and you and your descendants after you throughout their generations for an everlasting covenant, to be God to you and to your descendants after you. ... 10 "This is My covenant, which you shall keep, between Me and you and your descendants after you: every male among you shall be circumcised.
[Gen 19:1, 4, 6-7, 9, 12 NASB] 1 Now the two angels came to Sodom in the evening as Lot was sitting in the gate of Sodom. When Lot saw them, he rose to meet them and bowed down with his face to the ground. ... 4 Before they lay down, the men of the city, the men of Sodom, surrounded the house, both young and old, all the people from every quarter; ... 6 But Lot went out to them at the doorway, and shut the door behind him, 7 and said, "Please, my brothers, do not act wickedly. ... 9 But they said, "Stand aside." Furthermore, they said, "This one came in as an alien, and already he is acting like a judge; now we will treat you worse than them." So they pressed hard against Lot and came near to break the door. ... 12 Then the two men said to Lot, "Whom else have you here? A son-in-law, and your sons, and your daughters, and whomever you have in the city, bring them out of the place;
Lot was an alien to the land of Sodom. God's covenant with Abraham was extended to save Lot and family. So when the two heavenly men went down to the city, they went to destroy it because the Amorites very likely refused circumcision and the covenant of purity with God. It was all known to God, who gave a way of escape but the Amorites proved God right. Not only were the Amorites fugitives in a land that was now given to Abraham, but they betrayed the mercy that Abraham had plead for. Their iniquity was complete.
Conclusion: I believe that God will not change His decisions, but I believe that it is because nothing changes.--there isn't a single thing that surprises God. There isn't a single thing that can surprise God.
So, Spiritbear, I agree with your spirit of evangelism, but the woman at the well has more to do with what you want than Sodom and Gomorrah. The woman at the well was a Samaritan( a descendant of a cursed, immoral people from Joshua's time). Yet, they find grace and salvation because of the faith of one woman at a well. I would headline it this way: " We are a cursed people, meant to return to Christ."
We are advocates for the sake of the world, but God is not mocked( people will either accept the Gospel, or reject everlasting life with the Creator). It may be a shame on our shoulders, if we don't try to share our testimony and example of purity with the world; but based on what I know from these chapters of Genesis and of Corinthians, their bad decisions are not blood on our heads.