Do all men repent? Sure, God don't want mankind to perish, but its a fact that they will and not all men will repent.
In this day and age, as well as in Isaiah's time, men look to all sorts of things thinking they can find a way to heaven and God.
John Gill comments saying:
"And not to idols, nor to any creature, nor to the works of your hands; to your own righteousness and doings; to your wounds; to your tears and humiliations; to your own hearts and frames; to your graces and the exercise of them; all must be looked off of, and Christ only looked unto by a direct act of faith, for righteousness, for pardon, for all supplies of grace, and for glory and eternal happiness. He is to be looked unto as the Son of God, whose glory is the glory of the only begotten of the Father, full of grace and truth; as the Lamb of God that takes away the sin of the world; as the only Mediator between God and man; as the Saviour and Redeemer of lost sinners; and considered in all his offices and relations: under all circumstances he is to be looked to; when in the dark, look to him for light; when dead and lifeless, look to him for life; when weak, look to him for strength; when sick, look to him for healing; when hungry, look to him for food; and when disconsolate, look to him for comfort; for none ever look to him and are ashamed or disappointed, they have what they look for; and as it is profitable, so pleasant to look to Jesus, and he himself is well pleased with it; and therefore here encourages to it, adding,
and be ye saved;
or, "ye shall be saved" Christ is set up in the Gospel, and the ministration of it to be looked at, that men may be saved by him; and it is the will of God, not only that men should look to him, but that whosoever sees him, and believes in him, should not perish, but have everlasting life: the ministers of the Gospel are appointed to show men the way of salvation by Christ, and to assure them that he that believes in him shall be saved; and saints in all ages have looked unto him, and have been saved by him; and therefore this may be taken for a sure and certain thing, that such that look to Christ, as the Israelites did to the brasen serpent, the type of him, shall be saved, (
John 3:14 John 3:15 ) :
all the ends of the earth;
all that live at the furthest part of the earth; Christ has a people there, the Father has given him for his possession, and which are the purchase of his blood, and for whose sins he became the propitiation; and to these he sends his Gospel and his ministers, to find them out, and publish salvation to them, and to assure them, that however distant they are, both as to place and state, yet through looking to him by faith they shall be saved, even though they are the worst and vilest of sinners:
for I am God, and there is none else;
and so mighty to save, able to save to the uttermost, all that come to him, and to God by him, be they where they will; since he is truly God, there is virtue enough in his blood to pardon sin, and cleanse from it; and in his righteousness to justify from all sin; and in his sacrifice to expiate it; and therefore sensible sinners may safely look to him, and venture their souls on him."
One of the first things you'll have to learn is to read scripture in context. Yes it does say: "he shall save his people from their sins." (cf. Mt. 1:21) Ask yourself this: Who are "his people"? 1) this was primarily addressed to the Jews; 2) "His people" also is meant for His "elect".
Let me tell you a story. There was a certain man who went to a city. There he was to preach. They went to church one day and listened to what was said. After that, they stood up and began to preach. One of them preached the history of Israel. Then tied it in with the Life and death of our Savior. It was a powerful message. Afterwards, they were sought out to preach again on the next Sabbath. As it turned out, the whole town, Jews and Gentiles turned out to hear them preach. An untold number repented and believed. Just who were these people? The elect. (cf. Acts 13)
This is a summary, but the point is valid. The Gospel is preached to all, but we know that only the elect will respond.
One minor note: most accuse Calvinists of twisting scripture with the doctrine of election and reprobation. Fact: one of the first persons to recognize this theory was a Roman Catholic Bishop around AD 490.
God Bless
Till all are one.