Genesis 22:2—How could Isaac be Abraham’s “only son” when he already had Ishmael?
Solution: The other sons of Genesis 25 were probably born later, being mentioned three chapters after Isaac is called his “only son.” Furthermore, they were sons by “the concubines which Abraham had” (Gen. 25:6) and were not counted as heirs of God’s promise. Likewise, Ishmael was conceived in unbelief by a concubine and not counted as heir to the promised inheritance. In addition, the phrase “only son” may be equivalent to “beloved son” (cf. John 1:18; 3:16), that is, a special son. God said clearly to Abraham, “in Isaac your seed shall be called” (Gen. 21:12).
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This excerpt is from When Critics Ask: A Popular Handbook on Bible Difficulties (Wheaton, Ill.: Victor Books, 1992). © 2014 Norman Geisler and Thomas Howe. All rights reserved. Used by permission. Click here to purchase this book.