Imagine this: you and your wife have tried and tried for years to have a baby. After so many failed attempts, you and your wife have finally given up all hope. Your wife no longer has her periods; you both have entered into old age. Then, God comes to you and says:

“I will surely return to you about this time next year, and [your wife] will then have a son.”

Your reaction, of course, is to burst out laughing. And when you tell your wife, she does the same.

But God knows what He’s doing–of course–and come the next year, you and your wife finally have a baby. You name him Isaac, as God directed, and life is good. Isaac grows up strong in your faith and you–of course–absolutely adore him.

Then God calls to you and tells you:

“Take your son Isaac… and there you shall offer him up to me as a sacrifice.”

Wait, what?

[The rest of the blog post can be read here.]