what are we supposed to say again when christians ask us where we get our morality?

[Rampant.A.I.]

To the OP: I think we get our morals through evolution.

Are behavioral dispositions moral because they evolved or did they evolve because they are moral?

Chad makes up bullshit to back up his position

Though animals may not possess moral behavior, all social animals have had to modify or restrain their behaviors for group living to be worthwhile. Typical examples of behavioral modification can be found in the societies ants, bees and termites. Ant colonies may possess millions of individuals. E. O. Wilson argues that the single most important factor that leads to the success of ant colonies is the existence of a sterile worker caste. This caste of females are subservient to the needs of their mother, the queen, and in so doing, have given up their own reproduction in order to raise brothers and sisters. The existence of sterile castes among these social insects, significantly restricts the competition for mating and in the process fosters cooperation within a colony. Cooperation among ants is vital, because a solitary ant has an improbable chance of long term survival and reproduction. However as part of a group, colonies can thrive for decades. As a consequence, ants are one of the most successful families of species on the planet, accounting for a biomass that rivals humans.[1][2]

Humanity evolved morality, much like ants, bees, and termites, because moral action is evolutionarily conductive to the survival of the species.

"It has only been observed in certain species, because it really hasn't been studied extensively, but I would expect that moral sentiments would be fairly widespread among mammals," Bekoff told Life's Little Mysteries, a sister site to LiveScience.

Much of Bekoff's research has focused on wolves and coyotes — both of which live in tight-knit groups governed by strict rules. Bekoff has observed acts of altruism, tolerance, forgiveness, reciprocity and fairness among wolves and coyotes, and says many of these moral sentiments are evident in the way the animals play with one another.

http://www.livescience.com/16814-animals...point.html

It wasn't until far later in their evolutionary history that humans had to fabricate bullshit sources of their innate morality, and not until later still that they'd have to defend their innate morality against presuppositional bullshit from a religious tradition, only a few thousand years old, that would deign to claim all morality for themselves, without even bothering to solidify a single moral principle of their own without stealing it from previously extant cultures, and claiming they had invented it.