Although I do see where the author is going with their argument, I feel there are some weaknesses in their argument. I will recopy the outline of the argument and afterwards challenge them:
1. If any being aligns with the concept of a God (GCB), then that being will be worthy of worship (unconditional obedience).
2. Unconditional obedience to such a God would require abandonment of one’s moral autonomy.
3. Human beings exist as morally autonomous agents.
3a.It is not possible for morally autonomous agents to owe anyone or anything unconditional obedience.
4. Therefore, there is no God for human beings that is worthy of worship (unconditional obedience) (1,2,3, MP).
5. Therefore, there is no God (1,4, MP).
I challenge premise three on the basis that some human beings are not, in fact, morally autonomous agents. For example, many disabled human beings cannot exert their moral autonomy because they are challenged in some cases mentally or physically. As a result, another individual has to exert morality over them, guiding them to do certain behaviors and avoid other ones. In view of this evidence that some human beings are not morally autonomous agents, the author’s argument is very well undermined. The author’s argument is undermined because how could a person without moral autonomy surrender their “no moral autonomy” to God, after deciding to believe in Him/Her/It? This concept would be absurd because some humans do not have any, adding doubt to the idea that to obey God one has to surrender moral autonomy.
I definitely agree with you
@Francesco di Piertro that a human being who is morally autonomous can choose to believe in a God that can offer them the best possible life without neglecting or surrendering their own autonomy. Where I do think the issue comes from is the institutions that claim to advocate for said God. In some religious institutions people do surrender their moral autonomy. For example, the Greensboro Baptist church in North Carolina is known to demand money and obedience from their attendees, and if they don’t, they forgo their chances of entering Heaven and be sent to Hell. In those instances, however, people are not surrendering their moral autonomy to a God but to a human institution and their rules. With this in mind, the issue is not God but rather religious institutions, because the concept of God which most people agree to is someone who is unconditionally loving.
Thanks for your post!