Daniel 3 is about trusting God in uncertain times.  Shadrach, Meschach, and Abednego refuse to bow down and worship the huge statue the king has made of himself.  They get called "on the carpet" to answer to him.  They tell him that God is able to save them, but even if He chooses not to, they will not worship his idols.  God did not promise them that He would save them from the fiery furnace.  They had to trust Him.  We are living in uncertain times, and God doesn't promise us what He will do in each and every situation.  He simply invites us to trust Him and see what happens.