"God said" appears 54 times in the Bible and the Bible itself claims to be inspired directly by God (2 Timothy 3:16; Deuteronomy 29:29; 2 Peter 1:20-21), furthermore it's purpose is for our instruction and hope (Romans 15:4). His word can be trusted.
"The central purpose of God's revelation in the Bible is to call all people into awareness of their sin, the availability of God's marvelous grace, and the need for repentance and faith that results in complete forgiveness and fellowship with God. All people are sinners by nature and by choice and are, therefore, under the judgment of God. Those who call on the Lord Jesus Christ for forgiveness, believe in His resurrection and receive Him as their Savior are granted salvation, forgiveness of their sin and are regenerated by the Holy Spirit into a new life in Christ. This act of salvation is based solely on the grace and mercy of God, is not the result of human deeds or goodness." - Grace Church Eden Prairie