This question is not easy to answer. On the one hand, the Bible is very clear that God is perfectly good and holy (see for example Luke 18:19 and Isaiah 6:3) and that we can never blame Him for sin (James 1:13). But on the other hand, we confess that God is almighty and that He knows everything, including what will happen in the future. So, if God knew from the beginning that Adam and Eve would sin, why did He not stop them when He could? Why did He allow Adam and Eve to sin? Doesn’t that make God somehow guilty for their sin? Before answering this question, let’s first look at two incorrect answers that Christians commonly give.
Common incorrect answers
The first incorrect answer is to say that God did not know that Adam and Eve would sin; and because He didn’t know, we shouldn’t blame Him for their actions. However, this answer is clearly incorrect: the Bible teaches us that God knows everything (1 John 3:20), including all our thoughts (Psalm 139:1-2; Hebrews 4:13) and all the things that will happen in the future (Psalm 139:16; Isaiah 42:9; 46:9-10). This means that when God placed the tree of the knowledge of good and evil in the garden and told Adam and Eve not to eat its fruit (Genesis 2:9), God already knew that Adam and Eve would later commit this sin (Genesis 3:6). What’s more, God also knew that their disobedience would bring sin and death into the world (Romans 5:12).
The second incorrect answer is to say that, although God knew they would sin, He couldn’t stop them. This answer is also clearly incorrect: the Bible teaches us that God can stop sin if He so desires (Genesis 20:6; 1 Samuel 25:34).
Some Christians ignore Scripture and use the philosophical argument: “God doesn’t want us to be robots; He wants us to truly love Him, with our own free will. But if we have free will, we must also be able to sin against God and reject Him.” We quickly see the problem with this argument when we think about future life in heaven and in God’s new world.
In the new creation, will Christians truly love God? Yes! (Revelation 2:4-7)
In the new creation, will it be possible for Christians to sin? No! (Revelation 22:14-15)
In the new Creation, will we be robots? No! (Revelation 22:17)
So, it is possible to truly love God without choosing to sin. And if God can make this so in the new creation, then there’s no reason why He couldn’t have made the original creation in the same way if He had wanted.
Back to the question
So, to summarize so far: God knew that Adam and Eve would sin; and God consciously allowed them to sin when He could have stopped them. So, we return to our original question: “Why did God allow Adam and Eve to sin?” The answer becomes clear when we remember the purpose of all creation: the glory of God (Romans 11:36; 1 Corinthians 10:31; Revelation 4:11) through His Son, the Lord Jesus Christ (Romans 16:7; Philippians 2:11; Jude 25).
How did Adam and Eve’s sin ultimately lead to God being glorified through the Lord Jesus Christ? When God placed the tree of the knowledge of good and evil in the garden, He looked forward through time and saw not only the sin of Adam and Eve, but also the day when He would send His only Son to be crucified for our sins (1 Peter 2:24), and to elevate creation to a new glory even greater than the glory God created with the Lord Jesus in the beginning (Romans 8:21; Revelation 21:1-4).
Furthermore, by sending Jesus, God proved Himself faithful to the gospel promises He made personally to Adam and Eve in the Garden of Eden (Genesis 3:15; 20-21).
God’s plans were greater
If God had kept Adam and Eve from sinning, perhaps they would have lived happily ever after in the garden, worshipping Him as the mighty and generous Creator of the universe (Revelation 4:11). But God’s plans were greater than this. Allowing Adam and Eve to sin enabled God to finally reveal His glory in an even greater way. Today, we know God, supremely, as the One who so loved the world that He gave His only Son to die for us (John 3:16).
God did not stop Adam and Eve’s sin, but rather permitted it and then came to our rescue. Therefore, He will be known for all eternity, praised, and glorified, not only as the Creator, but also as the righteous Judge of the wicked (Revelation 19:1-4), and the Savior of repentant sinners (Revelation 7:10). He is a Savior so merciful that He suffered freely to redeem even His enemies (Romans 5:8)—even shedding His own blood for their forgiveness (Acts 20:28).