Yeah but hell will be so cool with all the people who think, they will probably develop air conditioning, rain control, power generation equipment and have a multitude of classes and technologies.
In contrast, the people in heaven will rely entirely on the Bible, things will break down and the Christians will all strut around, each holier than the next, looking down their noses, interpreting their Bibles in their own idiosyncratic ways to leverage greatest personal advantage, bickering about arcane, trivial details and plotting to kill those who are of other sects.
The reason that some do not believe in the Bible is that the fundamental premise of an all powerful God establishing really dumb criteria to get into heaven is impossible to believe. Some do not believe because the Bible is contradictory, illogical, irrational and some of the statements fly in the face of empirical evidence to the contrary.
God needs to edit and revise the Bible, making it more consistent with reality, changing the rules of heaven admission, and writing in a style that does not require interpretation.