Do you propose no religion? If so, where is the moral compass? Who establishes it?
You don't need religion for a moral compass and, as Graeme frequently points out, organized religion frequently lacks one as much as anything. Look at the evangelicals supporting Donald Trump in the USA even given his scandals (divorced twice, openly had affairs).
And, honestly, religion has often been used as a bludgeon to enforce a dominant group's prejudices as "morality" rather than actually encouraging people to think about what is right and wrong. Think about how religion has been, and often still is, frequently used to attack LGBTQ for instance. Or, as Graeme suggests, to attack those opposing wars and violence.
Moral philosophy, using reason to figure out principles that will ensure the best outcomes for the most people, can do morality. It offers the opportunity to think about what we do and why we do it rather than just enforce a bunch of dubious thousand year-old rules. It lets us find that moral compass ourselves. From my standpoint, a moral agnostic/atheist like Bertrand Russell accomplished far more good than some of the Christians who blindly supported the state and shrilly attacked his pacifist positions on WWI and Vietnam.
Everyone needs a north star.
Do you propose 8 billion north stars, one for each person in the world today?
Why not? Why not simply follow the UU fourth principle of a "free and responsible search for truth and meaning" instead of expecting everyone to conform to a particular faith or philosophy? If people want to align with a particular faith group, great, but no faith group should be "in charge" outside their own membership. True separation of church and state would go a long way towards dealing with what Graeme describes.
Most people and most civilizations have their God/god and believe their God/god to be on their side.
Is that not normal? Even when opposing sides in battle share the same God?
Being the historical norm does not make it right. I just watched a documentary this morning that talked about the people in ancient Mesopotamia believed that when cities fought, their gods also fought. Is that really a healthy model for the modern world? Using religion to uphold hatred of the other and support human conflicts? Any modern religion that is seriously claiming to be following a "Prince of Peace" needs to look very critically at the idea of God supporting human warfare.
I agree with you that Graeme sometimes goes too far in his attacks on Christianity, but there is a lot of truth in what he says even if we do not like how he says it. All too often, Christianity has used God to support wars and other harmful actions. All too often, Christianity has used God as a weapon to enforce prejudices and support positions that are otherwise unsupportable.
But if you want to refute Graeme's position, then join him in criticizing Christianity's moral failings and encourage the faithful to fix the faith's flaws instead of trying to shoot him down. Present a Christianity that truly is a moral faith of peace and his arguments go away.