How do you know that your religion is moral? The Abrahamic "God," if he/she/it actually exists, is a vile, murdering, hypocrite who, according to the Bible and Torah, has slaughtered thousands, if not millions, of people and commanded his* followers to murder countless other peoples. You claim that you are the ultimate morality, but why should we believe you? How is your system just? And if it is not, why should we adopt flawed morals?
"All things are subject to interpretation whichever interpretation prevails at a given time is a function of power and not truth."** Everything is filtered trough a cultural or personal filter before it is judged to be "good" or "evil" - and those things are always changing. I do not believe that certain things are "good" and others "evil," for how can anything be completely positive or negative? You are making an asinine generalization about peoples' actions and providing no evidence to back-up your viewpoint.
I do not know that, but I do know that there is no reason to believe some magic-man did it.
*I use words like "he" and "his" not because I believe that god, if such a being is real, is male, but due to the fact that I must have that part of speech there.
**Friedrich Nietzsche