Blood Retribution For Sin?

Below is a question that was proposed on the Facebook WCG Survivors page.  He asks a valid question that more and more Christians are also looking into.

Born-again Atheist

Hello, as a person who has committed his mind to being governed by reason, I have a few objective observations about Christianity, and would like to pose questions for the consideration of Christians who also seek rational thought. These questions are NOT meant to offend or bring vitriol, only to spark rational, respectful discussion.

My first question: Why is it NECESSARY for an ALL-POWERFUL god to take human life in RETRIBUTION for sin? Why could that god not simply forgive sin IN THE FIRST PLACE, WITHOUT demanding human sacrifice (OR a substitute for it)?

The interesting thread is here:  Reasonable Questions for Your Consideration