Who is Like God? (Micah 7:14-20)

The Lord is a God who is serious about his justice.  He will deal with the foreign people who make a mockery of His name and He will drive out His people who also make a mockery of His name.  This is something that we expect a sovereign God to do.  This expectation is not what makes God necessarily unique from all the other gods.  What is the ultimate thing that makes God unique for the other gods?  How do we have a relationship with this God?  How do we know that he really is the Lord of lords and the King of kings?