God told Adam in the garden not to eat from a certain tree then he and Eve did.  Adam defied God for his own personal well-being.  God does not sin and if he overlooked sin then he would be approving sin.  So, he must separate himself from sinners or his association with sin would make him sinful.

Those sins include (found in Isaiah 59):

·         Murder

·         Lies

·         Injustice

·         Troublemakers

·         Violence

·         Rebellion

God promises to repay sinners for their sins, unless they repent (verse 20).  God does not want separation.  He wants to be reunited and he took those steps through the temple in the Old Testament, on to Jesus to remove that separation.