Sodom and Gomorrah and God's judgement in the Christian age From my understanding of the story of Sodom and Gomorrah, God agrees to spare the cities even if a few righteous people live there. In the Christian age, our righteousness is imputed to us by Christ's atoning sacrifice. Does this mean that God's judgement will not come to pass as long as there a Christians living in a region?
And drawing nigh he said: Wilt thou destroy the just with the wicked?
  
  Genesis 18:2


And, 


  if this is so, then the Lord knows how to rescue the godly from trials and to hold the unrighteous for punishment on the day of judgment
  
  2 Peter 2:9


The first passage is a reference to Abraham before Sodom, interceding with the Lord.  The second is also speaking of Lot and Sodom.

In one sense, you could say that God is holding off judgment because of those who are and will be righteous because of Christ.  This pattern is seen may times in Scripture.

There are some valid considerations, however.

In Sodom, the judgment was total, from which Lot was saved.  Not all judgment is of the same degree.  Certainly,  God preserves His elect.  But, no matter what it looks like, God is still just and faithful.  One cannot judge adequately in this life what calamities God should and should not save people from, or what calamities are acceptable, or even who His elect even are (without personal insight, that is).

While the general truth is valid, even if God were to destroy the whole Earth with fire today, was He unjust?  His righteous are with Him, whoever they are, and the wicked are consumed.

So, yes, as a general rule, but specific situations can be a little but tricky (e.g., whether God should or should not judge America similarly, which is how it is often raised).