MYSTERY OF ROMANS 9-11: addressing a crisis in the early church

Romans is a profound book outlaying Gospel truths.
Yet most Bible Colleges teach Romans 1-8 and stop. Why?
Whats is in Romans 9-11that is like the proverbial elephant in the room?
And what is the crisis facing the church at Rome, that Paul is so desperate to address? Sadly, we have the same crisis today - an many don't want to talk about it!