I pointed to this idea in another thread. Probably regarding the gay lifestyle. That is, the idea that the wicked destroy themselves, they don't need us proclaiming 'God's judgement' on their lives because it's already there. That if we 'leave them alone, to their own devices, they will take care of their wickedness and eventually destroy themselves'.
Now, God doesn't enjoy the destruction of the wicked (Ez. 18:32).
But...God is a God of freedom and choice. He allows people to make bad and poor choices.
Another example I see this 'wicked will destroy themselves' is this NYTimes article. http://www.nytimes.com/2015/04/05/style/no-kids-for-me-thanks.html
Basically, it states that America is having a culture shift towards 'childless' couples.
Much of America isn't really Christian. They don't live out Chris-like principles of the Sermon on the Mount.
But the ones that do, many, not all, are reproducing, physically through their families.
Sure we need evangelism and repentance but people are being stuck in their ways and through a holy family, I think is a better testimony than just shotgun evangelism.
I see this as a good thing. Yes, the numbers of titled 'christians' will dramatically reduce but the number of pure and holy ones will dramatically increase. This to me is much better than having the title of 'a Christian nation'.
God only needs a few. It looks like He is starting with a few.
Feel free to debate any aspect of this. I just wanted to share one of my thoughts that I had in a different thread, in a new, current example.