“1. I am speaking of society in general. 100 years ago, if you slept with a woman who was not your wife, it was considered intolerable, and both parties would have been ostracized. Yes, what is considered moral changes with society.”
In my community and the America I live, adultery is still considered intolerable and those who commit adultery are ostracized.
Perhaps attitudes are different in your part of Texas.
“2. Yes, what we consider moral now may not be considered so in the future, or vice-versa.”
In this and most Western nations, we have the Bible to help guide our moral values. And nowhere in the Bible have I found a passage that states that the morals set forth in the Bible can be eliminated over time.
I think you're incorrect; while you and your neighbors may well disapprove of adultery, unless you can force your local adulterers to wear a scarlet "A" you do tolerate the presence and behavior of adulterers.
and those who commit adultery are ostracized.
They may or may not be shunned by some of their relatives and friends, but by society at large? Not so much. This isn't the 17th Century, after all. And speaking of that...
In this and most Western nations, we have the Bible to help guide our moral values.
"Most"? Which Western nations don't have access to the Bible?
And nowhere in the Bible have I found a passage that states that the morals set forth in the Bible can be eliminated over time.
The fact is, morals do change over time, regardless of what the Bible says. Slavery is considered an evil act today by the vast majority of people. In the 19th Century, we fought a war over it. 2,000 years ago, it was the norm.
Morality, ethics, and religion are human inventions. They're opinions, not universal laws. The universe itself enforces the Heisenberg uncertainty principle. It doesn't enforce "Thou shalt not murder".
Which is precisely the reason why one of the main planks in the liberal yankee agenda is to eliminate Christianity.