William Lane Craig argues that objective reality cannot exist without God. As I argue here, this isn't evidence that a God exists; it's merely an appeal to undesirable consequences. The many horrific godly actions described in the Bible also make clear that such a God's moral viewpoints wouldn't be worth following even if he did exist, and such atrocities don't match up with Craig's description of God as "perfectly good, loving and kind."
You can't describe religious morality as "objective" if it allows for Christians to disagree with each other on every single moral question while also citing scripture to support their viewpoints. Finally, without God, people can still use reason and empathy to decide right from wrong, and despite this process being imperfect, moral progress *is* made over time.