Part 1
Romans 10:20 "I was found by those who did not seek Me; I was made manifest to those who did not ask for Me."
Galatians 2:21 "I do not set aside the grace of God; for if righteousness comes through the law, then Christ died for nothing."
Christianity is correct to say righteousness is by faith, but incorrect to say having faith depends on/is up to you.
The NT reveals: 1 - The original condition of sinful human nature has no faith in God, and 2- Right standing (righteousness) with God is by faith.
So, the salient question becomes: Does moving from no faith to faith depend on you or God?
Hebrews 12:2 - "Jesus is the originator (author) and finisher of faith."
Jesus does not offer faith; He authors faith. Therefore, the answer is clear: Moving from no faith to faith, depends on God, not you! (Chapter 3 speaks to this in detail.)
God's solution to our state of no faith is to freely give us faith. Therefore, Christianity's answer – that we must choose to believe/accept the gift of faith - is not according to God; it's according to human nature under the law. It's an expression of self-righteousness, because human nature is inherently self-righteous.
For example:
Galatians 3:2 - "This only I want to learn from you. Did you receive the Spirit through the works of the law or by believing what you heard?"
Translation: Were you the cause of receiving the Spirit, or God? (Stay with me now.)
This text is telling you: 1- Your experience of believing what you hear (faith) is God's work/because of Him, and 2 - receiving from God because of Him, directly contrasts observing the law, which is because of you. (These are the two covenants, and Paul wrote the book of Galatians to contrast the two covenants.) The human experience of believing what they hear from God is the work of God...man has nothing to do with it causally. (Romans 10:17, John 6:28-29, Hebrews 4:2, 12:2. See Chapter 3 for additional texts.)
Throughout his letters, especially Galatians and Romans, Paul implores the listener to remember they have the Spirit because of who God is and what He's done (mercy, grace, promise, Spirit, inheritance, election, etc.), not because of who they are, and what they've done (keep the law, works of the flesh, human will and effort, etc.)
Contrasting causality is the point of Galatians and arguably the main point of the entire NT, because contrast equals awareness. No contrast; no awareness. Because of Him is contrasted with because of us, according to the Spirit, with according to the flesh, the natural order (Esau), with His promise (Jacob), etc. (See Romans 3:23-24, Romans 5, Galatians 4:21-28, 2 Cor 12:9-10, Romans 4:1-8, 9:6-16, and John 6:28-29 for but a few examples.)
John 6:28-29 - "Then they said to Him, "What shall we do, that we may work the works of God?" Jesus answered and said to them, "This is the work of God, that you believe in Him whom He sent."
Note the difference between what they asked, and how Jesus answered. They wanted to know what they have to do (sound familiar?), and He answered, "This is the work of God…" He didn't tell them what they need to do; He told them what God does. Your experience of faith in Jesus is the work of God, you played/play no causal role.