The Bible describes these events, and as a Christian I do believe the Bible. However, I think the philosophical Moral Argument, while not without its problems, is quite compelling.
For instance if someone is drowing and you can help, you know you should, but why? Perhaps it is a "herd instict" that tells you to help, but what is the "voice" in your head that tell you it is right to help and wrong to let the person drown. The "voice," your conscience, is not the herd instict, but something different because it does not force you to help, it just tells you that the should because it right