“It is fit that God should be glorified whatever becomes of you. You are dear to God, but God’s name is dearer to Him than you are…You have had a great loss and affliction upon you, but God has had glory. God has glorified Himself.”
Jeremiah Burroughs, Gospel Worship, p. 10.
https://heritagebooks.org/products/gospel-worship-burroughs.html
"Such is the blessed end of the man even of little faith (Mark 9:14-29). Weak faith will not remove mountains, but there is one thing at least that it will do; it will bring a sinner into peace with God. Our salvation does not depend upon the strength of our faith; saving faith is a channel not a force. If you are once really committed to Christ, then despite your subsequent doubts and fears you are His for ever."
- J. Gresham Machen, What Is Faith? (1925), 251.
In Mark 9:14-29, the weakness and limit of men is demonstrated, especially with regard to faith, and so is the answer to men's weakness:
Luke 17:5 (KJV), "And the apostles said unto the Lord, Increase our faith."
Mark 9:24, "And straightway the father of the child cried out, and said with tears, Lord, I believe; help thou mine unbelief."
“A weak faith may also be true faith, when it is otherwise of the right kind. A fire is not at once a bright blazing flame, but it often starts with a single spark.” - Otto Thelemann, An Aid to the Heidelberg Catechism, 79
Hebrews 12:2a, "Looking unto Jesus the author and finisher of our faith."
Notice what the Epistle to the Hebrews tells us, that Christ doesn't just finish or complete it but is the one who gives us the faith to begin with. This is why the Westminster Shorter Catechism puts it this way:
Question 86: What is faith in Jesus Christ?
Answer: Faith in Jesus Christ is a saving grace, whereby we receive and rest upon him alone for salvation, as he is offered to us in the gospel.
It is a saving grace, meaning it wholly begins with the gracious act of God, and doesn't begin with man or his acceptance. It is strengthened by Christ who works it in us by His Spirit completing that work at our death.
Praise God, our salvation relies not upon any faith made by the strength of men, but on a faithful Savior who is powerful, mighty, and gracious to save sinners.