“You cannot be “good without God.” If there is no God, there is no such thing as good. There is only opinion. One person’s opinion may be that murder is wrong, another person’s opinion may be that murder is right. Without God, there is no absolute morality, and no grounds to condemn anyone — including Christians.”—
This is an unfortunate opinion. Altruism has been observed in a number of social species (even including, interestingly enough, bats)! Behavior that benefits the group as a whole is a necessary development in socially cooperative animals, and as such we’ve evolved over thousands of years to possess an innate moral code. If you look at any stable society across the world regardless of religion, for example, indiscriminately murdering within one’s in-group is ALWAYS considered wrong. Rape, incest, stealing, etc are also taboo in most societies — and if they aren’t considered taboo, it’s most likely due to a disruptive factor in that society’s environment (a modern example would be extreme poverty). Human morality pre-dates human religion and is not beholden to it. In fact, we wouldn’t be what we are and who we are WITHOUT morality! Imagine a prehistoric society where everyone just went around killing each other all the time; it would have died out pretty fast. Even neanderthals cared for their elderly and disabled. Religion can certainly aid in moral growth, and I know plenty of people for whom religion is a positive, wonderful thing, but claiming that it’s the root of all goodness is a vastly ignorant assumption.