Is the Abrahamic Covenant a Lot of Mumbo-Jumbo?

I never imagined that the Abrahamic Covenant was so complex and so challenging as I just recently experienced.  The richness of study is worth it.  But as a pastor of an equally complex and challenging congregation, I thought yesterday, someone might still be asking, "What relevance is that for me?  Isn't this just a lot of theological 'mumbo-jumbo'?" 

So here is one paragraph that I wrote hoping to show everyone the important relevance this promise, covenant,  has for every Christian.   Here's the paragraph (it comes from the last 5 sermons):

Modern debates such as predestination,  eternal security, racial prejudice, holiness, grace, God's sovereignty and human responsibility, Israel, Gentiles, law vs. grace, etc., etc. are all resolved in the Abrahamic Covenant.  Just as US citizens tend to find their national identity and direction in the American Constitution, Christians find their hope, their rest and their comfort in the Covenant God made with Abraham.  It is one of the most important studies a Christian can spend their time on in reflection and worship.

To be a Christian, is to “… Abraham’s offspring, heirs according to promise.” (Galatians 3:29, ESV).