God is absolutely and perfectly holy (Isaiah 6:3); therefore He cannot commit or approve of evil (James 1:13). God requires holiness of us as well. First Peter 1:16 says, You shall be holy, for I am holy.
According to Scripture, everyone is guilty of sin: There is no man who does not sin (1 Kings 8:46). That doesn’t mean we’re incapable of performing acts of human kindness. But we’re utterly incapable of understanding, loving, or pleasing God on our own (Romans 3:10-12).
Romans 10:9 says, If you confess with your mouth Jesus as Lord, and believe in your heart that God raised Him from the dead, you shall be saved. Even though God’s justice demands death for sin, His love has provided a Savior who paid the penalty and died for sinners (1 Peter 3:18). Christ’s death satisfied the demands of God’s justice, and Christ’s perfect life satisfied the demands of God’s holiness (2 Corinthians 5:21), thereby enabling Him to forgive and save those who place their faith in Him (Romans 3:26).
True faith is always accompanied by repentance from sin. Repentance is agreeing with God that you are sinful, confessing your sins to Him, and making a conscious choice to turn from sin (Luke 13:3, 1 Thessalonians 1:9), pursue Christ (Matthew 11: 28-30 , John 17:3), and obey Him (1 John 2:3). It isn’t enough to believe certain facts about Christ. Even Satan and his demons believe in the true God (James 2:19), but they don’t love and obey Him. True saving faith always responds in obedience (Ephesians 2:10).