Should the people turn away from Christ to Islam, they will be destroyed. Same as if they turn away from Christ for secularism.
The fact is only Christ has the power to save this nation. And this land is a land of promise to those who will covenant with God and serve Him freely. Christ teaches us the principles of the Gospel, it is by ignoring those principles we will destroy ourselves.
Our economy has already suffered because people decided to be dishonest, covetous, proud, violent, unwise stewards, etc. As we return to the values and principles Christ teaches us, we will find healing.
No Government made by man and run by man will survive when Jesus returns. Only God's Kingdom will survive.
God has planned to destroy this world first, then there will be peace in the next Heaven and Earth.
No body of Jesus is coming back. Christ is already here being witnessed by His last saint and as soon as the saint is killed, it will end the 1,000 year reign of Christ. Then, the end will come soon afterwards.