So if someone is born in a region, that happens to be of a different religion and they live a life of helping others, it is just punishment to have them experience eternal torment?
The apostle Paul answers this question in his letter to the Roman Christians:
Romans 1:18-21
18 For the wrath of God is revealed from heaven against all ungodliness and unrighteousness of men, who suppress the truth in unrighteousness,
19 because what may be known of God is manifest in them, for God has shown it to them.
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,
21 because, although they knew God, they did not glorify Him as God, nor were thankful, but became futile in their thoughts, and their foolish hearts were darkened.
If Paul is correct - and I believe he is - every person (who isn't laboring under a severe intellectual deficiency) understands innately that there is a God, a Creator, who made them. They can see Him in the nature of the universe and themselves. They also have a dim reflection of Him in their own conscience and the fundamental moral sense every human possesses. But, as Paul writes above, humans suppress the truth of God and turn instead to Self-worship. And so they all stand before God "without excuse." They had some knowledge of God - however vague - to which they had a choice to respond either positively or negatively. When they choose to turn from their innate knowledge of God, to suppress the truth of Him in their own lives, they move under God's wrathful judgment.
So, what about the person in a Hindu or Muslim-dominated society who never hears of Christ and his sacrifice for them? Should God give them a free pass on the basis of their ignorance? Well, if Hell was just about knowledge, perhaps He should. But Hell is about judging our
deeds; it is a punishment of our wickedness. We are condemned for turning from the truth to the worship of ourselves because doing so is a
sinful act. We act, at least some of the time, out of impure, selfish motives and in violation of the "law of God written on our hearts" (reflected in our conscience and God-given moral sense) and when we do, we sin. A just God must punish evil, He must punish sin. And so, since every person is guilty of sin, every person stands before God condemned. Thus, Hell is not something we can escape by pleading ignorance. Hell is a judgment upon our sinful thoughts, words and deeds, not a judgment upon the scope of our knowledge.
Beyond this, though, God promises that He will reveal Himself to all who truly want to know Him. And this has been the experience of many people not raised in a Christian community. Muslims, Hindus, Buddhist, even atheists who have genuinely wanted to know God have, regardless of their geography or social environment, come to faith in Christ. I have, for instance, heard a number of stories about how Jesus has revealed himself to Muslims in dreams. Some of their stories you can find on YouTube. I have heard missionaries tell of Chinese people and Africans who wanted to know God and asked Him to send to them someone who tell could them about Him. And when Christian missionaries appeared from the other side of the world to tell them of the Gospel and the God revealed in the Bible, they praised God for answering their prayers!
Anyway, God is not unfair about His punishment of the wicked. Though totally undeserved, He has offered to all a way to escape His terrible wrath and promised to make that way known to all who truly want to find Him. No one HAS to go to Hell.
Selah.