You don't need to believe in God to be a good person

The objection is right about behaviour

Absolutely true. Atheists can be morally admirable, and many are. Christians who suggest otherwise are both wrong and unkind. The Bible itself says that people without God's written law still show "the requirements of the law are written on their hearts" (Romans 2:15). In other words, Christianity predicts that everyone has moral knowledge, believer or not.

The argument is about foundations

The moral argument doesn't claim you need to believe in God to be good. It claims that God is needed for objective morality to exist. That's the difference between how we know morality and what makes morality real. You can use electricity without understanding physics; that doesn't mean electricity doesn't depend on physics. In the same way, an atheist can recognise and follow moral truths without believing in the God who grounds them.

This was the confusion at the heart of a famous exchange in the 2011 debate between William Lane Craig and Sam Harris. Harris argued that we can know what's good by focusing on the well-being of conscious creatures. Craig replied that the question isn't whether we can know morality, but what makes it binding.

Why foundations matter

If there is no God, what makes morality objective? Some atheists say moral truths are just brute facts (see Moral values could just exist as brute facts). Others say morality is about human flourishing. But why ought we to care about flourishing, especially when it costs us? And why would morality have authority over us, the kind of authority that can command self-sacrifice? Many atheists accept the moral law fully but find it hard to explain where it comes from.

A misunderstanding to avoid

Saying "without God, there would be no objective morality" doesn't mean atheists would behave badly. It's a philosophical claim about the nature of right and wrong, not a prediction about how individuals behave. And Christians have no grounds for moral superiority. In fact, the Christian story begins with the claim that everyone, including believers, has failed to live up to the moral law.

How to explain this to a friend

Start by affirming their goodness. Then ask: "Why do you think kindness is really better than cruelty, not just something you prefer?" That's where the interesting conversation begins.

A fair concession

The moral argument is debated, and many careful philosophers think morality can be grounded without God. It's a serious conversation, not a knockdown.

How to explain this to a friend

Start by affirming your friend's goodness clearly and sincerely. Then ask a question that moves from behaviour to foundations: "Why do you think kindness is really better than cruelty, not just something you prefer?" Most people have never been asked that. It invites reflection rather than defensiveness, and it gets to the actual point of the moral argument, which is about what makes morality real, not who behaves well.

The bottom line

You don't need to believe in God to be good. But you might need God for goodness to be more than a preference. That's the real question, explored on The moral argument for God.