My conversion from philosophical atheism to whatever-sort-of-Christian-I-am-now came over the course of a couple of weeks, after having a series of epiphanies about what it is to be human.
The first of these epiphanies came after watching a video where the animal behavior researcher, Frans De Waal, explains the ongoing project to “discover” the rules of human morality based on a detailed study of animal and human behavior. He conducted experiments showing moral behavior in elephants, dogs, monkeys. What intrigued me most was the experiment that proved that monkeys (and even birds and dogs) show a consciousness of fairness:
In the experiment the monkeys are trained to perform a simple task for a reward. The two monkeys were accustomed to getting one cucumber slice for each task. During the stream of tasks the monkeys performed the researchers gave one of the monkeys a grape for their task instead of a cucumber. When the second monkey received only a cucumber slice for his task, he immediately threw the cucumber back at the researcher, screamed, and shook his cage in protest. The dramatic emotional response from the monkey was eye-opening.