OK DL maybe I can help you.....
God doesn't send the devil (for the exception of Job from what we know) what he does do is allow the devil in once in a while to test your faith....God wants to see if you are really didicated...God could do those things himself but he made a promise to the New Covenant Church (the New Testament Church) that he wouldn't do us like he did the people of Old....Jesus dying on the cross was the key that sealed God's wrath on us and the Devil has been after us even harder ever since... The devil is after power and power is in the holy spirit in which God inparts in us as well as in his annointing so the devil works to get that annointed and a lot of the time god has nothing to do with tyhe devils work in us or rather on us
The book of Job is a Jewish novel with the lesson about the role of Israel in the Counsel of God. In reality, Job, the man, never existed. Therefore, there was no such a thing as God sending the Devil.
God does not need to test the faith of anyone. Since he granted us freewill, He never interferes in the affairs of man.
And this "New Covenant" you are talking about was made between Paul and Christianity. It has nothing to do with the New Covenant with the House of Israel and the House of Judah. (Jer. 31:31)
Jesus was not the only Jew to die on the cross. The Romans crucified thousands of Jews just like Jesus. Their sacrifice does not count? Why? Because Paul said so? Who was Paul to have that power?
Ben:shout