God is Good so, Good is God?

This week, I read about how Religion is Necessary for Ethics. It was an article that spoke about the Divine Command Theory and its counterpart, the Autonomy thesis. As I read through the article found that the divine command theory confused me. It also made me very curious. The article itself talked about morality and what is right and wrong and who decides what is right and what is wrong. I think that the idea that the Divine Command Theory proposes is mind boggling.  Basically, from what I understood, the theory proposes that God decides what is right and what is wrong, what is good and what is evil. It says that God has the power to decide, so if he declares something that was once a bad thing, is now a good thing, or 'tells' somebody that something they are about to do is good, his approval automatically makes whatever the things was, good, just because He said so. The reason I found this confusing was because while the liberty that God has to choose on what is good and what is bad, clearly becomes the standard for human followers/ believers to go on when making decisions, does this mean that all that God claims as either one is really that? Thinking back, there is a part in the Bible there that talks about how God told Abraham to kill one of his sons. Then when Abraham was about to do it, right at the last second, God told him to not do it. But Abraham was only going to do it because God told him to, so he thought it was the right thing to do when in reality all God really wanted was for his devotion to be proved. So if this Divine Command theory was actually the real theory for how it works, would it justify the things that were done in the past, and that we now see as bad because those people claimed God told them to do so? I mean, would it justify even mass murders done by the decisions taken by the people in power in the of God?

It also confuses me how the Divine Command Theory and the Autonomy thesis are in the same article because they technically cancel each other out. The DTC says morality originates with God, The Autonomy Thesis says morality doesn’t come from God, DTC says Moral rightness is willed by god and moral wrongness is against will of god, The Autonomy Thesis says Right and wrong aren't based on the will of God, DTC says Morality is based on divine will, not on existing reasons for action, no further reasons for action are necessary, while the Autonomy thesis says that There are reasons for acting one way or the other that can be independent of God's will. In other words, they basically cancel each other out, invalidate each other’s defense, so what really is the point of this article? To present the reader with information to help make a choice on which is correct, Autonomy or DTC?