Why would God allow deception?

from the old testament

• Satan, not God, is the deceiver. The first deception recorded in Scripture proceeded from the devil's forked tongue when he told Eve that eating fruit from the tree that God forbade would not result in death (Genesis 3:4). This act fits the definition of deception perfectly, as the devil was making intentionally false statements in order to mislead Eve into disobeying God's commandment. However, the fact that Eve was deceived does not exempt her or Adam, who took the fruit also, from responsibility for their disobedience, as they sinned against the truth that God had already revealed to them (Genesis 2:16–17). They chose to doubt and disobey God's truth and exchanged it for the devil's lie. Adam blamed Eve and indirectly blamed God Himself for giving Eve to him; Eve blamed the devil (Genesis 3:12–13). They were deceived by their disobedience.
• God cannot lie (Numbers 23:19). God is the complete opposite of the devil. God speaks the truth because when He speaks, He speaks from His character.
• God created the angels—including the one who later became the devil—and human beings with genuine free will (Genesis 1:26–27; 2:16–17; Psalm 104:4; Isaiah 14:12–15; Ezekiel 28:12–17).
• Sin did not originate with God but through the rebellion of Satan and the disobedience of humanity (Genesis 3:1–7). At the same time, God remains fully sovereign over all creation and has placed firm limits on the power and reach of evil (Job 1:12; 2:6).
• Evil is neither unchecked nor eternal but operates only within boundaries God allows and for a time He has determined (Psalm 103:19; Daniel 4:35; see Revelation 20:1–3).
• God is carrying out His redemptive plan with perfect wisdom and purpose, ultimately using even human and demonic rebellion to accomplish His good and glorious ends (Genesis 50:20).

from the new testament

• In John 8:44, Jesus says the following of the devil, "He was a murderer from the beginning, and does not stand in the truth, because there is no truth in him. When he lies, he speaks out of his own character, for he is a liar and the father of lies." Not only does the devil deceive, he is the father of deception.
• Adam and Eve’s sin in the garden had the exact effect that God promised, as they experienced fear, shame, guilt, and ultimately physical death (1 Corinthians 15:21). Instead of becoming like God, they became spiritually dead. They began to shift the blame for their knowing and willful disobedience, attempting to deceive God.
• The sin of Adam and Eve was passed on to us, and we are therefore born with a sin nature (Romans 5:12). This is clearly seen both in Scripture and in life. If you observe early childhood development, you will see that no one has to teach a child to lie. It is natural to them. As we grow up, our lies become more hidden and sophisticated, but we still lie. We may soften the blow by calling them "white lies," but who among us always speaks the complete truth one hundred percent of the time? Only God speaks perfect truth every time He speaks.
• Sin itself is described in Scripture as deceitful (Hebrews 3:13; Mark 4:19). Why? Because it promises what it cannot deliver. Sin promises life but ends in death; promises joy but ends in despair; promises pleasure but ends in punishment. Often, we choose to be deceived by sin, wanting to trust its false promises and acting out of our fleshly nature, rather than trusting and standing in the truth of God.
• God calls us to not be deceived and gives us all we need to not be deceived: His Word and His Spirit. I appeal to you now, do not be deceived, believe in Jesus Christ today and begin to live in the light and in the truth (2 Corinthians 5:20–21; John 8:12; Ephesians 1:13; 6:10–18).
• Part of God's plan is to display who He is. The existence of sin (including deception) allows for the manifestation of His attributes, which brings Him glory. This can be seen most clearly in Romans 9:22–23: "What if God, desiring to show his wrath and to make known his power, has endured with much patience vessels of wrath prepared for destruction, in order to make known the riches of his glory for vessels of mercy, which he has prepared beforehand for glory." The existence of sin allows for the display of God's justice in punishing sin and for the display of His mercy in forgiving sin.

implications for today

God is truth, and He is the Father of truth. Fortunately for us, God is not only truth. He is also love. Because God is love, He sent His only Son into the world to speak the truth and to die for sinners like us (Romans 5:8). In fact, Jesus claimed that He Himself is the way, the truth, and the life, and that no one can come to the Father but through Him (John 14:6). It is only by believing the truth that Jesus is the Son of God who lived a perfect life, sacrificed Himself for our sins, and rose again from the dead, that we can be saved from the eternal death which we deserve based on our sinfulness (Romans 6:23).

God (who cannot lie) promises eternal life to all who receive Jesus Christ as Lord and Savior (John 3:15). God promises love and joy and peace to those who walk in and are filled by the Spirit (Galatians 5:22–23). Those who forsake the fleeting pleasures of sin and place their faith in Christ can look forward to a heavenly city, where they will reside forever with He who is true (Hebrews 11:10, 24–25; Revelation 21:3; 1 Thessalonians 5:24).

Where is God when deception happens? Why does He allow deception to happen and continue? God is not absent, silent, or indifferent. He remains sovereign and present, even when lies distort the truth (Psalm 33:11; Proverbs 19:21). We must remember that deception arises from the devil—the father of lies—and from human hearts that reject God’s truth (John 8:44; Jeremiah 17:9; Romans 1:25). Yet God allows deception for a time, not because He approves of it, but because He has granted humanity real moral responsibility and permits choices that reveal what we truly love and trust (Deuteronomy 30:19; Joshua 24:15).

At the same time, God does not leave us defenseless against deception. He exposes lies through His Word, which is truth, and through His Spirit, who leads believers into all truth (Psalm 119:160; John 16:13). God uses even seasons of deception to refine faith, test hearts, and call people to repentance and discernment (Deuteronomy 13:3; 1 Peter 1:6–7). One day, all deception will be fully judged and removed, and the truth of God will reign without opposition (Matthew 13:41–43; Revelation 20:1–3; 21:27). Until then, God calls us to abide in Christ, love the truth, and stand firm, confident that “the Lord is faithful” and will bring His purposes to completion (2 Thessalonians 2:10–13; John 8:31–32; 1 Thessalonians 5:24).