In Luke 18:8 Jesus raises a troubling question: "when the Son of Man comes, will He find faith on the earth?" Most Christians are expecting the Lord to return in a glorious way, but by raising this question Jesus is bringing to the light what he apparently sees as being a very distinct possibility: that when he comes he may find a world devoid of faith in him. But why?
Reverend Moon points to this verse as one of those which let us know that the Lord will not come back on literal clouds. If Jesus really did appear suddenly in the sky, accompanied by the fanfare of trumpets, then who would be able to deny who he is? Even those opposed to him would have to recognize his identity. But, if the Lord were to come in a more covert way (such as by being born as a baby), it is easy to imagine that many Christians would reject him.
Jesus at his first coming also faced a problem of faith. In his book, "The Master Plan", Kevin McCarthy points out that in regards to Jesus there were two types of faith. One was the faith of expectation. Many, many Jews of 2000 years ago were expecting and waiting for the Messiah. Of that type of faith there was an abundance. Nevertheless, it didn't help Jesus because all these people ended up rejecting him. That is, the faith of recognition was in very short supply. In that sense, although so many were yearning for the arrival of the Messiah and believing that he would come soon, Jesus found no faith on earth.
Similarly, in this present era millions of Christians really believe that Jesus is coming soon, so the faith of expectation is again high. But if the Lord were to come like a thief, in a way unexpected, how many Christians would believe in him? Wouldn't he more likely be rejected and called an AntiChrist? Luke 18:8 is a strong indication that prophecy of the 2nd coming will not be realized by the Lord coming on literal clouds.