Why not do the maths instead. We know we have this life. This is all we know. We don't know if we have an afterlife. If we assume there may be, we have the problem of working out what this afterlife entails and how we can make it better. We have no clues. The existance of an afterlife is pure assumption. The existance of god is pure assumption. The belief in that there exists a god that has an intelligence and that god cares about earth and humans is equally assumption. If we sit down and make a compilation over the possible varieties of heaven our human brains can conjour up, (all on equal merit to the Bibles version) we will find that the result is one chance in an infinity.
So the scenario you presented is skewed. It's not a choice between two equal possibilities. They're not even almost equal. One is pure guesswork and the other is fact.
edit: Ninjad. NatalieD beat me to it. I bow to your great wisdom.