Derrick Bell in Faces at the Bottom of The Well opened with a short story about aliens from space taking away all of the African-Americans. He was pessimistic about the reaction of white America, to say the least.
Analogously, let us ask ourselves, what would the Christians do, if all the abortionists, homosexuals, atheists, and all manner of publicly denounced sinners were to be spirited away. Imagine it as an inverse Rapture: only the Christians would be left to build their City of God.
How do you think they would get on?