Old Testament: circumcision, religious feasts, executing of adulterers, incest and same sex practioners.
Keeping the minutiae of the law. Dietary prohibitions.
Animal sacrifices required as basis of salvation.
One human high priest. Only Levites could be priests.
Focus on the Sabbath as requirement for salvation or death to be inflicted on violator immediately. Offenses against God and man punished immediately.
New Testament: no circumcision, no religious feasts, after repenting sexual sinners were welcomed.
Broad principles of the law preferred. Love for God is shown by love for fellow man. God's favor is vehicle of salvation.
Dietary principles either changed or not focused upon.
Christ's sacrifice is basis of salvation. Animal sacrifices abolished.
Unrepentant sinners punished at Second Coming of Christ.
Christ as high priest. Believers as nation of priests.
Sabbath mentioned incidentally or said that it was created for man and not man for the Sabbath. No death for violaters.
Summary: abusing fellow human beings is never tolerated by a just and loving God.
Abusing one's relationship with God, including not acknowledging him as being the supreme creator, is never tolerated by a just and loving God. Exodus 20:8,11
Execution of offenders will take place eventually.
A daily love relationship with Christ Jesus strengthens one's faith in his saving power. Getting to know him better is by hearing or reading the Bible. Daily prayer also provides great strength. Assisting fellow human beings with their needs is evidence of genuine faith. A desire to tell others about your great friend, Jesus Christ, is further evidence of a living and practical faith.
Fear God and give him glory for the hour of his judgment has come. Worship him who made the heavens, the Earth, the sea and the springs of water. Revelation 14:7