John's Gospel Through Jewish Eyes?

Anyone reading John's Gospel in the first century AD would get the impression that: 

• Jerusalem was no longer to be central to worship or to God's eternal purposes; 

• God wasn't all that impressed with the Jewish leaders of the day;
  
• Jewish ethnicity was irrelevant in the eternal scheme of things; and
  
• Gentile believers in Jesus need not become at all concerned with carrying-out Jewish customs.

Rather, the message of John was that salvation was all about believing in Jesus, regardless of ethnicity, and without the deeds of the Law.

(They wouldn't have got the impression that the future salvation literally of every living Israeli is an inevitable outcome, or that this thing we call the Gospel is merely some parenthesis added temporarily while we wait for God to once again turn his attention to His real purpose.)