You do not see true reality. You do not Understand what this world is really all about. All you see is what you want to see based on the corrupted view generated by a box of beliefs. Case in point: Everyone on Earth does not have a copy of your Holy Book. Many parts of the world will not allow it. Next case in point, aren't more people opting out of religion now than ever before? You might check statistics but I don't believe Christianity is the largest religion in the world today.
Real Truth has nothing to do with the numbers of believers it has. There was a time when most all people thought the world was flat. It seems flat from where I am standing, however one must value facts above beliefs in all things if one wants to live in true reality.
I agree, Real Truth has nothing to do with the numbers of believers as Jesus brought out in Matthew chapter 7.
'Few' are on the narrow road, 'many' are on the wide road leading to destruction if they do Not repent.
In other words, it is Not a question of 'quantity', but 'quality' as in bearing good fruit as listed at Galatians 5:22-23.
Christianity would never be the largest religion in today's world, or as Jesus pointed out that his followers would be hated according to Matthew 10:22.
I also agree, that Not everyone on Earth has a Bible, after all new people are being born each day.
As far as 'parts of the world Not allowing it' does Not mean the 'word', so to speak, is Not being spread.
Do you know anyone who has Not heard of the Bible.
Due to modern technology rapid Bible translation is now possible, and remote translation offices give people access to Scripture in their own mother tongue or native languages as never before was possible.
'Word of Mouth' absolutely does get around even if Not publicly broadcasted all over the place.
Remember what happened in Hitler's Germany. 'Word of Mouth' got around although under ban.
The Christians who would Not back Hitler were also in the camps and spread the ' Word'.
God's Word (Scripture) and God's people survived and still going strong in Germany.
When Russia had tried to ban God's Word, people would travel to Finland and have a basket of eggs or something and when asked what price for the product the Christians would say that the item is Not for sale, but that free spiritual food was available ( under the product ) and thus the ' Word ' was spread even under ban.
Many, many decades ago, there was a missionary who traveled to a seeming non-Christian country.
When he got there he hailed a taxi, and the taxi driver started to tell the missionary about the Bible.
So, where it was thought there were No Christians, right on day one that missionary found one.
Also, years ago the Lighthouse keeper, who lived at the last Lighthouse nearest to Antarctica, his wife was a Christian who spread the "Word" even in that remote area of Earth.
I think we can also keep in mind that we are Not readers or judges of people's hearts.
Jesus will decide who are the figurative ' sheep ' or Not of Matthew 25:31-33. We do Not do the judging.
I find Matthew 24:14; Acts 1:8 is definitely Not talking about any world-wide conversion before the start of Jesus' coming 1,000-year governmental rulership over Earth begins.
That ' box of beliefs ' is what is between the pages of Genesis to Revelation.
When we open that ' box of beliefs ' we find how paradise was lost in Eden, and how through Jesus mankind will see paradise regained on Earth because mankind will see the return of the Genesis ' tree of life ' on Earth as mentioned at Revelation 22:2 for the healing of earth's nations. Good times are coming !