Good, we're marking progress - you now recognize that murder and human sacrifice made perfect sense in many bronze age cultures, and your understanding of morality is based on the extant Axial age religions, which includes Judeo-Christianity.
Regarding your statement, the Jewish and Christian religions didn't even exist until long after Abraham, and the important part of that story is that no child sacrifice actually took place. The 'thou shall not kill' commandment came to Moses in the form of the Decalogue, around a thousand years after Abraham.