Acts 4:12
Salvation is found in no one else, for there is no other name under heaven given to mankind by which we must be saved.”
When men say all or the world they are talking about all they are seeing and all they know.
They are not God, so trying to show them as a meaning that all men all is limited by mans perspective.
So to Paul he reaches all he knew of. We have our ends of the earth to reach
When the scriptures says Satan, who leads the whole world astray. He was hurled to the earth, and his angels with him.
He is not talking about believers who are in the world and not of it.
When God said all men He is talking about everyone single person all He knows of.
When He said that He loved world that He sent His Son, He loved the world everyone heathens, sinners like me that He sent His Son, not that the whole world will be saved, the next line is your answer to who will be saved whosoever believes in Jesus.
It is a shame how men try to destroy the message of the Holy Spirit, by trying to say He meant something else. If the Holy Spirit meant something else He would of said what He meant. I like Spurgeon said about all men.
"What then? Shall we try to put another meaning into the text than that which it fairly bears? I trow not. You must, most of you, be acquainted with the general method in which our older Calvinistic friends deal with this text. "All men," say they,—"that is, some men": as if the Holy Ghost could not have said "some men" if he had meant some men. "All men," say they; "that is, some of all sorts of men": as if the Lord could not have said "all sorts of men" if he had meant that. The Holy Ghost by the apostle has written "all men," and unquestionably he means all men. I know how to get rid of the force of the "alls" according to that critical method which some time ago was very current, but I do not see how it can be applied here with due regard to truth. I was reading just now the exposition of a very able doctor who explains the text so as to explain it away; he applies grammatical gunpowder to it, and explodes it by way of expounding it. I thought when I read his exposition that it would have been a very capital comment upon the text if it had read, "Who will not have all men to be saved, nor come to a knowledge of the truth." Had such been the inspired language every remark of the learned doctor would have been exactly in keeping, but as it happens to say, "Who will have all men to be saved," his observations are more than a little out of place. My love of consistency with my own doctrinal views is not great enough to allow me knowingly to alter a single text of Scripture. I have great respect for orthodoxy, but my reverence for inspiration is far greater. I would sooner a hundred times over appear to be inconsistent with myself than be inconsistent with the word of God. I never thought it to be any very great crime to seem to be inconsistent with myself; for who am I that I should everlastingly be consistent? But I do think it a great crime to be so inconsistent with the word of God that I should want to lop away a bough or even a twig from so much as a single tree of the forest of Scripture. God forbid that I should cut or shape, even in the least degree, any divine expression. So runs the text, and so we must read it, "God our Savior; who will have all men to be saved, and to come unto the knowledge of the truth."
Does not the text mean that it is the wish of God that men should be saved? The word "wish" gives as much force to the original as it really requires, and the passage should run thus—"whose wish it is that all men should be saved and come to a knowledge of the truth." As it is my wish that it should be so, as it is your wish that it might be so, so it is God's wish that all men should be saved; for, assuredly, he is not less benevolent than we are. Then comes the question, "But if he wishes it to be so, why does he not make it so? " Beloved friend, have you never heard that a fool may ask a question which a wise man cannot answer, and, if that be so, I am sure a wise person, like yourself, can ask me a great many questions which, fool as I am, I am yet not foolish enough to try to answer. Your question is only one form of the great debate of all the ages,—"If God be infinitely good and powerful, why does not his power carry out to the full all his beneficence?" It is God's wish that the oppressed should go free, yet there are many oppressed who are not free. It is God's wish that the sick should not suffer. Do you doubt it? Is it not your own wish? And yet the Lord does not work a miracle to heal every sick person. It is God's wish that his creatures should be happy. Do you deny that? He does not interpose by any miraculous agency to make us all happy, and yet it would be wicked to suppose that he does not wish the happiness of all the creatures that he has made. He has an infinite benevolence which, nevertheless, is not in all points worked out by his infinite omnipotence; and if anybody asked me why it is not, I cannot tell. I have never set up to be an explainer of all difficulties, and I have no desire to do so."
Spurgeon