In the same way, if you know that your being continues its existance after death in the form of a soul, you also might begin to act differently.
Ah, the old fear of punishment incentive.
First, if there is a soul, we cannot know it for sure. We can believe it, even believe it strongly, but we cannot know that there is a soul.
When it comes to GOD, or souls, or IPUs, we are in the realm of faith & belief, not in the realm of something that can be known.
To use your analogy, if you believe there is a bomb on the bus, you may rush to get away and trample others in your fear,
even if you are mistaken about the bomb.
In the end, it comes down to behavior. If you love GOD and love others as you love yourself, the afterlife if it exists will be taken care of.
It really is as simple as that.
Aslan is not a Tame Lion