I can only go by the call and response shared in scripture. The pagan sailers and the pagan Ninevites repented and believed.It sounds like you are assuming that the Ninevites were granted saving faith. Maybe they were. However, even reprobates can reform themselves, if even for just a period of time - they can stop getting drunk, stop being sexually promiscuous, stop cursing, stop being gluttonous, etc. - but that does not mean they are saved.
There is a movement called "Straight Edge", which came out of hardcore punk, that has nothing to do with being a Christian.
"No drinking, no drugs, no smoking, no casual sex - these are the primary tenets of the straight edge subculture. In general, it's centered around abstinence as a means of rebellion. Most would agree that to be considered straight edge, you must abstain from consuming alcohol and drugs, smoking cigarettes, and engaging in sex outside of caring relationships, but many 'edge' individuals choose to abstain from other substances as well. Some avoid caffeine and medicinal drugs and even more choose to be vegetarian or vegan. Fundamentally, they strive for clean-living and positivity and view alcohol, drugs, and sex as crutches for people to forget their unhappiness."
- What is Straight Edge? - Definition & Lifestyle - Video & Lesson Transcript | Study.com
Now, 120 years later...
We see that it does not take long for a society to corporately abandon. Hence my link to Jeremiah 18.