Even Jesus said that just one among a thousand will go to heaven. Heaven cannot accommodate billions upon billions. They do not have the infrastructure.
27. "Look," says the Teacher, "this is what I have discovered: "Adding one thing to another to discover the scheme of things - 28.while I was still searching but not finding - I found one [upright] man among a thousand, but not one [upright] woman among them all. 29. This only have I found: God made mankind upright, but men have gone in search of many schemes."- Ecclesiastes 7
Well god really screwed up if it made heave too small!