The author is warning against easy "christianity" and warning folks to check their walk to see if it's genuine. Would you be willing to be martyred, to die for your faith in Christ as it is so in some countries? If not, you might want to check your walk. Persecution has the effect of separating the true believers from the false. If you don't really believe and hold to something, you're not going to risk life and limb for it. America has never experienced any kind of persecution like this. Do folks on easy street even realize the terrible turn around going on right now in our country? Or are they too caught up in the feel good itching ears philosophy?
These are the Kingdom now crowds and other heretics who think everything is just peachy! Easy believism, prosperity gospels, all manners of cults who say they have "god" at their center. He warns against these! The author is warning the readers of this impending judgment and the possible persecution that will surely come to pass if America as a collective doesn't return to the Biblical precepts that made our country the greatest of the world. Believers need not take offense or be discouraged by this, it's a well stated warning by a good watchman. This article was not all doom and gloom. It showed what a great nation we were and can be again if our people are willing.
No matter what comes to pass, God knows those that are His. Our Lord does not judge the righteous with the unrighteous. We will either be preserved through it like Noah if the end is not yet, or else taken out of the way like Lot or Enoch. And here's praying for the later! May it be soon Lord Jesus.