We need to have faith. A lot of us do have faith. However, note that Jesus did not wonder if He will find FAITH on earth. Rather, He asked 'Will I be finding THE FAITH on earth.' THE FAITH? Since salvation is of the Jews (John 4:22), Jesus must be wondering if He will find the Faith of the Jews (His Faith) on earth.
By definition, to be saved we must wholly embrace the requirement of John 3:16. To believe in Jesus is to listen to Him only. But He only speaks in parables and He says that not everyone may understand His parables () and adds that not anyone may know who He is (Luke 10:22). Yet, eternal life is knowing Him and His Father. He also declares that those of us who know Him have the ability to listen to His voice. He asks us to do things to be saved (). Sadly, most of us do not listen to Him. Most of us rather listen to men. How so?
In His parables in Luke 16, He asks us to still follow Moses and the Prophets to avoid going to hell. Yet, most of us declare that Moses is for the Jews and only speaks to an old society. As such, we cherry pick in Moses what we like and discard as we please even though Jesus clearly states in Luke 16 that it is easier for our world to disappear than one character in Moses to change.
Another example which shows that most of us Christians do not really listen to Jesus is our siding with men that He was risen in 2 days and 2 nights even though Jesus states that He was to stay buried for 3 days and 3 nights as a sign. But, just as Eve did in the garden of Eden, we choose to do opposite of what Jesus asks us even as we recite verbatim what Jesus wants from us.
Most of us dismiss what Jesus says, as did Adam and Eve, to do what men (Satan) say. If Adam and Eve were sentenced to death for dismissing the will or the word of Jesus, Jesus will not impart on us His grace if we also dismiss Him in anything to believe in men and to obey men instead.
If we do not follow Jesus in everything we cannot expect to be part of the citizenry in the brand new world which Jesus will again create.
Now Jesus, being turned and perceiving her, said, "Courage, daughter! Your faith has saved you." And saved was the woman from that hour. Matthew 9:22 CLV
Now He said to her, "Daughter, your faith has saved you. Go in peace, and be sound from your scourge." Mark 5:34 CLV
Go. Your faith has saved you. And straightway he receives sight and followed Him on the road." Mark 10:52 CLV
Now He said to the woman, "Your faith has saved you. Go in peace." Luke 7:50 CLV
Now He said to her, "Courage, daughter! Your faith has saved you! Go in peace!" Luke 8:48 CLV
And He said to him, "Rise, go. Your faith has saved you." Luke 17:19 CLV
And Jesus said to him, "Receive sight! Your faith has saved you." Luke 18:42 CLV
This one hears Paul speaking, who, looking intently at him, and perceiving that he has faith to be saved, Acts 14:9 CLV
For in grace, through faith, are you saved, and this is not out of you; it is God's approach present, Ephesians 2:8 CLV