State the criticisms Isaiah made against Israel's system of worship and what suggestions did he make?

Isaiah 1 :10-20:  
Isaiah said
that: 

• their sacrifices were meaningless, 
• God was fed up with their
  burnt offerings of ram and beast, 
• God was not delighted in the blqod of
  bulls and lambs, 
• they perverted justice, 
• their new moon and Sabbath He
  hated, 
• their offering was vain, 
• their incense was an abomination. 

 

 He suggested that:

• They should wash
  and be clean by removing evil from their doing/ casting away idols, 
• They
  should cease to do evil and learn to do good, 
• They should seek justice,
  correct oppression, 
• They should defend the fatherless and plead for the
  widow, 
• They should come to God and confess their sins so that they can be
  as white as snow total commitment to God. 
• If they were willing and
  obedient, they would eat the good of the land, 
• But if they refused, they
  would be devoured.

Three ways our
country can return to God:  

1. Fighting the cause of the poor, 
2. Having
   true repentance, 
3. Asking forforgiveness. 
4. Praying and fasting, 
5. Serving God whole heartedly. 
6. Forsaking sin and amending ways, 
7. Punishing injustice and anti-social behaviour, 
8. Encouraging good
   behaviour with reward.