Every word spoken to the Jews now applies to all believers, and every word spoken to the believers in Christ now applies to the Jews. All of our only hope is believing in him and walking in his ways. Jesus said I have not come to abolish the law, but to fulfill it. Not saying the old Jewish law applies to everyone, don't take me out of context, but I'm saying that while you are saying Luke 17 20-37 is being spoken exclusively to the Jews, Jesus himself made no such distinction. He was speaking to everyone, Jew and gentile alike. Jesus is a saviour to all and his words were spoken and applied to all men, everywhere.