No, my belief in divine law is based upon divine revelation. If you are a Christian, then you believe in divine revelation, that Sacred Scripture is the written record of that revelation, which is fulfilled in the person and work of Jesus Christ. 
Moreover,  to be a Christian is to be a disciple of Jesus Christ, which involves repentance and rejection of sin.  It is not "easy to follow." Each of us must take up his/her cross daily and follow him.  The "yoke" is easy, i.e., not burdensome like the Pharisaical interpretation of the Law.  But this is NOT a repudiation of the moral law. And no, I am not driving anyone to suicide. 

St. Paul believed this "nonsense" as you put it.