Although the old testament covenants differ from one another, they all offer god's protection if

They all offer god's protection if humans fulfill certain obligations.
But, many christians believe that they no longer tied to this obligations after Jesus Christ sacrifice Himself and unchained the people from these obligations.
So, according to the New Testament God's protection extended to those who believe and embodied the good nature that displayed by Jesus.

productive most commonly means: achieving or producing a significant amount or result.

explanation:

productive can also mean:

producing or giving rise torelating to or engaged in the production of goods, crops, or other commodities.

these depend on how the word productive is used. most likely productive will mean   achieving or producing a significant amount or result.