I don't know about others on here, but I am totally in agreement with what Galatians 3:14 says and salvation is the gift of God and that the Holy Spirit indwells a man. Just like I am totally in agreement that the means is by hearing the gospel by preaching or reading or by personal witness. These things are absolutely true without any qualifications or modifications needed. But the question still comes up - a group of people hear the word, or read it and yet there are a lot of different reactions. Some believe, others laugh or think it's foolish. Some become angry. Why is this. Well, there are other verses that tell us that our natural tendency is to do this also. So the Holy Spirit must play an active role in calling people and causing them to believe. In Philippians chapter 3 Paul talked about pressing on to make it my own because Christ Jesus has made me his own. Galatians 1:15 Paul says that he was set apart before he was even born. The verses about people being hardened show the danger of trifling with God in this area and the fact that you are not in control of this.
All I'm saying as a Calvinist is that there are plenty of verses that indicate something else is going on in addition to obtaining the right knowledge of the gospel. Jesus himself would do a miracle and some people would believe and others would resolve to kill him. There are modern atheists who study the Bible for years and know way more than you or I and would demolish us in a debate but never get saved. I say it's because God is sovereign in who gets saved and that the Holy Spirit is involved in turning to Christ. What you do is every time you read a verse, if it doesn't say everything about a subject then you are not allowed to look at another verse for more explanation. If the Bible says faith comes by hearing, that does not mean then that the Holy Spirit is not allowed to act on the person hearing just because it didn't explain it in that verse.
You seem to be thinking there is some type of magic involved in salvation. There is not. One must process the information that God gives about himself and his salvation and submit to it. The key is believing the words. You say you believe Ga 3:14 but then question it because everyone who hears does not receive the promise.
When Paul wrote these following words in AD 58 he had already been severely beaten 5 times by the Jews, left for dead at Lystra and had to escape the lynch mob by scaling a wall in a basket.
1 Brethren, my heart’s desire and prayer to God for Israel is, that they might be saved.
2 For I bear them record that they have a zeal of God, but not according to knowledge.
3 For they being ignorant of God’s righteousness, and going about to establish their own righteousness, have not submitted themselves unto the righteousness of God.
Verse 3 says why they will not be saved. They have not submitted themselves to the righteousness of God. They have not believed in Jesus Christ, who is his righteousness.
Paul says in another letter that he attempts to persuade men to believe and receive God's salvation because he knows the end of a man who dies unsaved.
2Co 5:11 Knowing therefore the terror of the Lord, we persuade men; but we are made manifest unto God; and I trust also are made manifest in your consciences.
12 For we commend not ourselves again unto you, but give you occasion to glory on our behalf, that ye may have somewhat to [answer] them which glory in appearance, and not in heart.
13 For whether we be beside ourselves, [it is] to God: or whether we be sober, [it is] for your cause.
14 For the love of Christ constraineth us; because we thus judge, that if one died for all, then were all dead:
15 And [that] he died for all, that they which live should not henceforth live unto themselves, but unto him which died for them, and rose again.
16 Wherefore henceforth know we no man after the flesh: yea, though we have known Christ after the flesh, yet now henceforth know we [him] no more.
17 Therefore if any man [be] in Christ, [he is] a new creature: old things are passed away; behold, all things are become new.
18 And all things [are] of God, who hath reconciled us to himself by Jesus Christ, and hath given to us the ministry of reconciliation;
19 To wit, that God was in Christ, reconciling the world unto himself, not imputing their trespasses unto them; and hath committed unto us the word of reconciliation.
20 Now then we are ambassadors for Christ, as though God did beseech [you] by us: we pray [you] in Christ’s stead, be ye reconciled to God.
21 For he hath made him [to be] sin for us, who knew no sin; that we might be made the righteousness of God in him.
1 We then, [as] workers together [with him], beseech [you] also that ye receive not the grace of God in vain.
2 (For he saith, I have heard thee in a time accepted, and in the day of salvation have I succoured thee: behold, now [is] the accepted time; behold, now [is] the day of salvation.)
3 Giving no offence in any thing, that the ministry be not blame
Calvinism is self righteousness. When it claims God sends people to hell because he has not provided an acceptable sacrifice for them it is a denial of the person and work of Jesus Christ on behalf of the world. God has never told us he will save every sinner but he did say every sinner could be saved by coming to him through Christ.
Calvinism says only those sinners whom God has previously selected to be saved can come to him for salvation. That is not what God says. He says the following;
Joh 14:6 Jesus saith unto him, I am the way, the truth, and the life: no man cometh unto the Father, but by me.
Election is not the way, Jesus Christ is. Election is not the truth. Jesus Christ is. Election is not the life. Jesus Christ is.