Many people think of heaven like a mountain. There can be many routes and paths for climbing a mountain, but no matter which path you take, you eventually make it to the top. That’s fine for climbing mountains, but heaven is not a mountain.
The belief that everyone ultimately goes to heaven is called Universalism, and it is a rather common belief these days. For instance, when was the last time you attended a funeral and heard someone say that the deceased would not be in heaven? No, what we mostly hear is, “We know that he is in a better place.”
As hard as it might be to face the truth, not all people will end up in heaven. Scripture tells us that more people will reject God and enter eternity separated from Him than those who will receive Him and go to heaven.