Christians would survive and perhaps even thrive as we are driven back to our roots and our knees before God. The living may envy the dead but they will remember the president and the party that brought nuclear calamity upon us. The moaning over gay and trans rights and the rantings of nasty libs will be overshadowed by people just trying to survive!
Agreed he may well warn God fearing Christians to get out like he did with Abraham and Lott.