The vast majority of the undead - myself included - are very staunch atheists. One can only take being hunted down for simply existing, branded as unholy abominations against some aloof uncaring old man lounging among the clouds before resenting all that he stands for.

The notion that a the flapping of a butterfly's wings can cause hurricanes on the other side of the planet? While scientifically preposterous, even if we were to buy into such a philosophy, that would only serve to paralyze people in the now. A butterfly cannot sustain itself without the use of its wings, nor does it know that doing so would cause others discomfort. It simply acts in such a way as to sustain its existence. That is the natural order of things, and the undead should not be set apart from it out of fear of what might be. The future is not set in stone, and can only be influenced moment by moment. To allow fear to paralyze you, you become stagnant, and that is when decay and entropy sink their teeth into you, something the undead are all too familiar with.