Trouble with that is heaven only gets filled up with brown-nosed Christians. Spending enternity with them, is the opposite of heaven, so it isn't heaven.
If only Christians are allowed in heaven, it isn't heaven. See, you've contradicted yourself.
Just one of the many, many, many reasons the savation thingy falls flat on it face.

Anyway, not that it matters, that's not something any rational person worries about anyway.