What of Those That Have Never Heard of Christianity

This objection is, however, fallacious, because it assumes that those who have never heard about Christ are judged on the same basis as those who have. But the Bible says that the unreached will be judged on a quite different basis than those who have heard the gospel. God will judge the unreached on the basis of their response to His self-revelation in nature and conscience. The Bible says that from the created order alone, all persons can know that a Creator God exists and that God has implanted His moral law in the hearts of all persons so that they are held morally accountable to God (Rom. 1.20; 2.14-15). The Bible promises salvation to anyone who responds affirmatively to this self-revelation of God (Rom. 2.7). Now this does not mean that they can be saved apart from Christ. Rather it means that the benefits of Christ's sacrifice can be applied to them without their conscious knowledge of Christ. They would be like people in the Old Testament before Jesus came who had no conscious knowledge of Christ but who were saved on the basis of his sacrifice through their response to the information that God had revealed to them. And, thus, salvation is truly available to all persons at all times. It all depends upon our free response.

The book or Romans says anyone who would be saved, will be saved. So it matters not where someone is born as everyone willing will be saved. God knows who will accept him by there reaction to nature and there conscious. No one is sent to hell for not hearing the bible, but for sinning against a holy god.


12 Some people do not know God's law when they sin. They will not be judged by the law when they die. Others do know God's law when they sin. They will be judged by the law. 13 For the hearers of the law are not righteous before God, but the doers of the law will be declared righteous. 14 for when Gentiles, who do not have the law, by nature do the things in the law, these, although not having the law, are a law to themselves, 15 who show the work of the law written in their hearts, their conscience also bearing witness, and between themselves their thoughts accusing or else excusing them) 16 in the day when God will judge the secrets of men
-Romans 2 13-16


31 “Behold, the days are coming, says the LORD, when I will make a new covenant with the house of Israel and with the house of Judah— 32 not according to the covenant that I made with their fathers in the day that I took them by the hand to lead them out of the land of Egypt, My covenant which they broke, though I was a husband to them, says the LORD. 33 But this is the covenant that I will make with the house of Israel after those days, says the LORD: I will put My law in their minds, and write it on their hearts; and I will be their God, and they shall be My people. 34 No more shall every man teach his neighbor, and every man his brother, saying, ‘Know the LORD,’ for they all shall know Me, from the least of them to the greatest of them, says the LORD. For I will forgive their iniquity, and their sin I will remember no more.”
-Jeremiah 31 31-34


all know god through creation and what is made

20 For since the creation of the world His invisible attributes are clearly seen, being understood by the things that are made, even His eternal power and Godhead, so that they are without excuse
-Romans 1.20


The heavens declare the glory of God;
the skies proclaim the work of his hands.
2 Day after day they pour forth speech;
night after night they reveal knowledge.
3 They have no speech, they use no words;
no sound is heard from them.
4 Yet their voice goes out into all the earth,
their words to the ends of the world.
-Psalm 19.4

so he will sprinkle many nations,
and kings will shut their mouths because of him.
For what they were not told, they will see,
and what they have not heard, they will understand.
-Isiah 52.15

Nevertheless He did not leave Himself without witness, in that He did good, gave us rain from heaven and fruitful seasons, filling our hearts with food and gladness.
-Acts 14.17


In Colossians 1.23 Paul says every creature under haven has had gospel preached to them, the book was written in 60-62 A.D

Therefore, the One whom you worship without knowing, Him I proclaim to you: 24 “God, who made the world and everything in it, since He is Lord of heaven and earth, does not dwell in temples made with hands. 25 Nor is He worshiped with men’s hands, as though He needed anything, since He gives to all life, breath, and all things. 26 And He has made from one blood[c] every nation of men to dwell on all the face of the earth, and has determined their preappointed times and the boundaries of their dwellings, 27 so that they should seek the Lord, in the hope that they might grope for Him and find Him, though He is not far from each one of us; 28 for in Him we live and move and have our being, as also some of your own poets have said, ‘For we are also His offspring.’ 29 Therefore, since we are the offspring of God, we ought not to think that the Divine Nature is like gold or silver or stone, something shaped by art and man’s devising. 30 Truly, these times of ignorance God overlooked, but now commands all men everywhere to repent, 31 because He has appointed a day on which He will judge the world in righteousness by the Man whom He has ordained. He has given assurance of this to all by raising Him from the dead.”
-Acts 17


no one will be judged for sins they were unaware of

for where there is no law there is no transgression.
-Romans chapter 4. 15

If I had not come and spoken to them, they would not be guilty of sin; but now they have no excuse for their sin.
John 15.22 also 9.41

13 In fact, sin was in the world before the law, but sin is not charged to one's account when there is no law.
-Romans 5.13

Paul argues with the Jews in Romans chapter 3 saying how can the law save? Is god, god only to those that have the law?

28For we hold that one is justified by faith apart from works of the law. 29Or is God the God of Jews only? Is he not the God of Gentiles also? Yes, of Gentiles also, 30since God is one—who will justify the circumcised by faith and the uncircumcised through faith.
-Romans 3 28-30


An example of a believer in god who had not yet heard gospel message in Acts 16 v 14 it reads

14 One of those listening was a woman from the city of Thyatira named Lydia, a dealer in purple cloth. She was a worshiper of God. The Lord opened her heart to respond to Paul’s message. 15 When she and the members of her household were baptized, she invited us to her home. “If you consider me a believer in the Lord,” she said, “come and stay at my house.” And she persuaded us.

C. S. Lewis in Mere Christianity said

"There are people in other religions who are being led by God's secret influence to concentrate on those parts of their religion which are in agreement with Christianity, and who thus belong to Christ without knowing it. For example a Buddhist of good will may be led to concentrate more and more on the Buddhist teaching about mercy and to leave in the background (though he might still say he believed) the Buddhist teaching on certain points. Many of the good Pagans long before Christ's birth may have been in this position."
According to world famous evangelist Billy Graham, people can love or know Jesus without being conscious of it. If unbelievers who do not know the name of Jesus turn to the "only light they have" they are going to be in heaven:

"I think that everybody that loves or knows Christ, whether they are conscious of it or not, they are members of the body of Christ. . . . [God] is calling people out of the world for his name, whether they come from the Muslim world, or the Buddhist world or the non-believing world, they are members of the Body of Christ because they have been called by God. They may not know the name of Jesus but they know in their hearts that they need something they do not have, and they turn to the only light they have, and I think that they are saved and they are going to be with us in heaven."
-Billy Graham

The official stance of the catholic church agrees.

“Those who, through no fault of their own, do not know the Gospel of Christ or his Church, but who nevertheless seek God with a sincere heart, and, moved by grace, try in their actions to do his will as they know it through the dictates of their conscience - those too may achieve eternal salvation” (quoting, Lumen Gentium, 16).
“Although in ways known to himself God can lead those, who, through no fault of their own, are ignorant of the Gospel, to that faith without which it is impossible to please him, the Church still has the obligation and also the sacred right to evangelize all men” (quoting Ad Gentes, 7, another document from Vatican II).

“I am the way, the truth and the life, no man comes to the Father except by me” (John 14:6), which I quoted above, this same Jesus also said, “If I had not come and spoken to them, they would not have sin; but now they have no excuse for their sin” (John 15:22; see also John 9:41). Jesus presents a very important principle here. A person is not responsible for what they could not have known. …... “those who, without blame on their part, have not yet arrived at an explicit knowledge of God and with His grace strive to lead a good life” will not be denied by Divine Providence what the Council fathers called “the helps necessary for salvation” (Lumen Gentium,16).


Do all Old Testament Pagans all go to Hell?

Old testament Pagans have no law from God and thus while sinners and guilty before God and in need of his salvation, are not judged in the way Jews would have been see Romans 5.13 Romans 4.15. God overlooked former sins of pagans [ indicates some were believers in the true god] acts 17 22-30. Than after the resurrection Jesus preached the gospel to those who had died in Old Testament times and were sheol.

[I]They will give an account to the One who stands ready to judge the living and the dead. 6 For this reason the gospel was also preached to those who are now dead, so that, although they might be judged by men in the fleshly realm, they might live by God in the spiritual realm
-1 peter 4 5-6

18 For Christ also suffered for sins once for all, the righteous for the unrighteous,that He might bring you to God, after being put to death in the fleshly realm but made alive in the spiritual realm.19 In that state He also went and made a proclamation to the spirits in prison[ 20 who in the past were disobedient, when God patiently waited in the days of Noah while an ark was being prepared. In it a few—that is, eight people[—were saved through water
-1 peter 3 18-20

Children

Most Christians say babies who die young go straight o haven see Deuteronomy 1.39 Romans 5.13 7.9 numbers 14.29 and similar passages. King David had his infant child killed and in verse 23 it says "But now that he is dead, why should I fast? Can I bring him back again? I’ll go to him, but he will never return to me.”

David concluded that to see his child in haven he must also go.