It absolutely has gone out into all the world 2,000 years ago through the Apostle Paul and others. Those people groups who are existing now who are ignorant have had the gospel come unto them at some point in time. Their ancestors either rejected it or did a poor job passing it down to the next generation.
Romans 16:25-26, [SUP] "[/SUP]Now to him that is of power to stablish you according to my gospel, and the preaching of Jesus Christ, according to the revelation of the mystery, which was kept secret since the world began, But now is made manifest, and by the scriptures of the prophets, according to the commandment of the everlasting God, made known to all nations for the obedience of faith:"
Colossians 1:5-6, "[SUP] [/SUP]For the hope which is laid up for you in heaven, whereof ye heard before in the word of the truth of the gospel; Which is come unto you, as it is in all the world; and bringeth forth fruit, as it doth also in you, since the day ye heard of it, and knew the grace of God in truth:"
Colossians 1:23, "If ye continue in the faith grounded and settled, and be not moved away from the hope of the gospel, which ye have heard, and which was preached to every creature which is under heaven; whereof I Paul am made a minister;"
Once again Scripture tells us the gospel Paul taught had gone out unto all the world, to every nation, and preached to every creature under heaven.
Romans 16:25-26, [SUP] "[/SUP]Now to him that is of power to stablish you according to my gospel, and the preaching of Jesus Christ, according to the revelation of the mystery, which was kept secret since the world began, But now is made manifest, and by the scriptures of the prophets, according to the commandment of the everlasting God, made known to all nations for the obedience of faith:"
Colossians 1:5-6, "[SUP] [/SUP]For the hope which is laid up for you in heaven, whereof ye heard before in the word of the truth of the gospel; Which is come unto you, as it is in all the world; and bringeth forth fruit, as it doth also in you, since the day ye heard of it, and knew the grace of God in truth:"
Colossians 1:23, "If ye continue in the faith grounded and settled, and be not moved away from the hope of the gospel, which ye have heard, and which was preached to every creature which is under heaven; whereof I Paul am made a minister;"
Once again Scripture tells us the gospel Paul taught had gone out unto all the world, to every nation, and preached to every creature under heaven.
Not yet, according to how that part is to be interpreted (people groups or nations) there are still quit a few left yet. But we are getting close.