So, lets assume that heaven and hell exist
How many people must there be in Hell? Billions? Trillions?
Some of these people have done things that are wrong, they have murdered or robbed or whatever. However, if belief is necessary to get into heaven, you will also have scientists, Hindus, Buddhists, and all others who, because of what they believe is true, do not accept Jesus as the son of God.
How can heaven be such a good place, if being there would mean these billions of people would be suffering the most unfathomable torment for eternity and there is nothing you could ever do about it.
This isn't as glib as it sounds, it is somewhat serious. Presuming you go to heaven, how could you live for eternity knowing that these souls are suffering this way. I know personally that would be hell. I can honestly say that is not a heaven I would want to go to.