Your question have been used by this brilliant Islamic researcher by the name of Hassan Farhan Al-Maliki who adressed this issue using a similar example. In one of his "controversial" interviews in a sectarian based TV show. [Link by the end of the post]
He gave the example of an old woman living in her farm in Srilanka, and who only heard of Islam explosions and terrorisms. How would she believe or even be interested?
The idea of the judgement of such people can be extracted from the statutory verses in the Quran.
I'd first like to address some points.
Every human being has a duty to fulfill in a way that God would NEVER be unjust to ANYONE. This is very important to consider.
2:286 God does not burden any human being with more than he is well able to bear....
Among the many misconceptions are that Quran is for Muslims and that God and the Prophet are for the Muslims. Or even that the Arabic language is the language of God.
21:107 And thus, (O Prophet) We have sent you as a mercy for the worlds.( i.e all mankind)
7:54 VERILY, your Sustainer is God, who has created the heavens and
the earth in six aeons, and is established on the throne of His
almightiness.43 He covers the day with the night in swift pursuit,
with the sun and the moon and the stars subservient to His command:
oh, verily, His is all creation and all command. Hallowed is God, the
Sustainer of all the worlds!
Who is going to Hell ?
1-The act of Shirk(association): In the context of someone who received the scripture and is a submitter to God, everything can be forgiven except association
4:47-48 O You to whom the scripture was given! Believe in what We have now revealed, that confirms the truth in what you already have, before We efface the whole beings such that they turn back in utter confusion. Thus had We rejected the Sabbath breakers. The commandment of God is always executed. God does not forgive that divinity be ascribed to other than Him. But He may forgive anything else, to whom He wills. Whoever associates partners with God, has thus, devised a tremendous drag on his own person.
9:17 Those who associate others with God, (whether idols, dead saints, religious or temporal leaders), shall not administer God’s Masjids, the Centers of the Divine System – while they witness against their own ‘self’ - denial of truth. All their works are in vain and they will abide in the fire.
2- Rejecters (Kufar): It's a sensitive definition that got twisted into "if you are not Muslims you are a "kafir" and you are going to hell", usually mistranslated to "disbeliever". However, according to the Quran Kufar are those who Acknowledge the truth and deny it or cover it. And they are going to hell forever. they are also refered to as Hypocrites.
2:89 And when a Book came to them from God, authenticating what is with them; while before that they were mocking those who rejected; so when what they knew came to them, they rejected it(Kufr)! The curse of God be upon the rejecters.
The Hypocrites: Usually goes hand in hand with the Kufar, could be a trait of the Kufar too.
9:68 God promises the hypocrite men and women, and the rejecters, the fire of Hell for their abode. It suffices them. They deprive themselves of the grace of God, and theirs is the lasting torment.
Who is going to Heaven?
Anyone can go to Heaven by the judgement of God only, in a way or another, besides the clear cases stated above.
Some sects among muslims don't hesitate to make people Kufar and make themselves people of Heaven. Leaving no judgement to God. That is WRONG according to the Quran itself.
4:49 Did you not see those who ascribe purity to themselves? No, it is God who purifies whom He wills, and they will not be wronged in the least. See how they invent lies about God! And that is enough as a clear sin.
I hope this answer clarifies the issue.
This is the interview:Can atheists go to heaven in Islam ?