This is not true. Animals think on this level but humans have the capacity to empathize and thereby know their harmful actions on another are simply not nice. It's called the Golden Rule. You don't need religion to enter into morality. Morales are a human invention - and should always be thus. Furthermore, I probably needn't remind you of the horrific actions done in the name of religion (with Christianity at the forefront of the bloodshed). While it may be easy for you to dismiss these people as not "true" Christians, I'd say a person who kills for monetary wealth is not a true HUMAN.

I know you want to place the blame somewhere, I understand this feeling, but unfortunately Christianity has been a tool for bloodshed one hundredfold compared to evolution and/or atheism (the latter two of which have a death count of exactly 0).

There are countless people who believe in evolution yet wouldn't so much as harm a fly. Moreover, I don't know of a single person who has ever actually used evolution as a means of saying "We can kill indiscriminately, it's natural, it's survival of the fittest." Now let's talk about Christians who HAVE.