How Can I Know, Lord God? What Abram's Bold Questions Teach Us About Doubt

By the time we reach Genesis 15, God has already promised Abram descendants as numerous as the dust of the earth (Genesis 13:16). Abram has left his homeland on the strength of that promise. He's fought a battle, rescued his nephew, and turned down a king's reward. And he still has no child. He's old. His wife Sarai is old. The promise has had years to come true, and instead there's nothing.

God speaks to Abram again: "Do not be afraid, Abram. I am your shield, your very great reward" (Genesis 15:1, NIV). Abram's answer is not gratitude. It's a direct challenge: "Sovereign Lord, what can you give me since I remain childless...You have given me no children" (Genesis 15:2-3, NIV). He says it plainly, without softening it for God's benefit. The promise, as far as Abram can tell, has produced nothing.

How Can I Know?

God responds by restating the promise — descendants as numerous as the stars (Genesis 15:5) — and Genesis tells us Abram believed him, "and he credited it to him as righteousness" (Genesis 15:6, NIV). This is one of the most important verses in the Bible; Paul builds much of the book of Romans on it. But what happens immediately after is just as important, and gets skipped far more often.

Abram asks a second, even bolder question: "Sovereign Lord, how can I know that I will gain possession of it?" (Genesis 15:8, NIV) He has just been credited with righteousness for believing God, and in the very next breath he asks God to prove it. This isn't a man with tidy, uncomplicated faith. This is a man who believes and still wants evidence, in the same conversation, without any indication that God found the second question offensive after crediting the first as righteousness.

God's Answer to a Doubting Question

God doesn't rebuke Abram for asking how he can know. Instead, he gives him a strange and elaborate sign: a covenant ceremony involving split animal carcasses, and then, after Abram falls into a deep sleep, "a smoking brazier with a blazing torch appeared and passed between the pieces" (Genesis 15:17, NIV) — God himself, in a symbol of fire, passing alone between the halves of the covenant, binding himself unilaterally to the promise.

Notice what God does not do: he does not tell Abram that asking "how can I know" was a failure of faith. He answers the question with a concrete, visible sign, tailored to Abram's specific doubt, in a culture where covenant ceremonies like this one were the strongest guarantee available. Abram's doubt was met with evidence, not correction.

Faith and Doubt in the Same Conversation

What makes Genesis 15 so useful for anyone wrestling with doubt is how directly it contradicts the idea that faith and doubt can't coexist in the same person, or even in the same sentence. Abram is credited with righteousness for believing God's promise about descendants, and moments later he's asking for proof about the same promise's fulfillment. Scripture doesn't flag this as a contradiction or a lesser form of faith. It records both, back to back, as part of one honest relationship with God.

This matters because so many of us assume that any lingering question after a moment of genuine faith means the faith wasn't real. Abram's story argues the opposite: you can believe God and still ask him "how can I know," and both can be true about you in the very same breath.

What This Means for You

If you find yourself believing something true about God and still wanting more assurance — still asking "how can I know this will actually happen, that you'll actually come through" — you are not contradicting your faith. You're doing what Abram did in the very passage that became the foundation for the doctrine of justification by faith.

Practically, this means you don't have to choose between bringing your doubts to God directly and trusting him. Abram modeled both in one conversation. It also means you can expect God to sometimes answer specific doubts with specific, tangible reassurance — not because he owes it to you, but because that's how he responded to Abram. And it means resisting the temptation to measure your faith by the absence of questions. Abram's faith is the model Scripture holds up precisely because of, not despite, the questions attached to it.

Frequently Asked Questions

Q: Did Abram doubt God even after being credited with righteousness? A: Yes. Genesis 15:6 says Abram believed God and it was credited to him as righteousness. Just two verses later, he asks God, "How can I know that I will gain possession of it?" Scripture records both without treating the second as a contradiction of the first.

Q: How did God respond to Abram's doubt? A: God didn't rebuke Abram for asking for assurance. He answered with a formal covenant ceremony, appearing himself as a symbol of fire passing between the sacrificed animals, binding himself to the promise in a way Abram's culture would have recognized as the strongest possible guarantee.

Q: What does Abram's story teach about doubt and faith? A: That genuine faith and honest questions can exist side by side in the same person and even the same conversation with God. Doubt that asks God directly for assurance isn't the opposite of faith — in Abram's case, it appears right alongside the faith Scripture calls righteous.

A Closing Prayer

Sovereign Lord, like Abram, I believe you, and I still find myself asking how I can know for certain that what you've promised will come to pass. Thank you that this question didn't disqualify him, and that you answered it with evidence instead of correction. Meet my specific doubts the way you met his — not with shame, but with whatever assurance I need to keep trusting you. Amen.

Reflection Questions

What promise from God do you believe, and yet still find yourself asking, "How can I know"?

How does it change your view of doubt to see Abram ask this question in the same conversation where his faith was credited as righteousness?

What would a tailored, specific reassurance from God look like in your current situation — and are you willing to ask him for it directly, the way Abram did?