>Contract law? God did not place contingencies on the original covenant. There was not two side to uphold, God just made a promise. Abraham was not instructed to do anything to keep his side of the deal.
That's true; God did make an unconditional covenant with Abraham, for His people.
That promise did not cover those who swear feilty to Satan, as the Synagogue did. Those, by definition do not want God's covenant, anyway.