“Who is that God that shall deliver you out of my hands?” This was uttered by Nebuchadnezzar to Shadrach, Meshach and Abednego. Did the Lord Almighty answer that question raised by the Babylonian King Nebuchadnezzar; or was it the answer to the Faith reposed by the three in a statement to the King thus:
“our God whom we serve is able to deliver us from the burning fiery furnace, and he will deliver us out of thine hand, O king.”

Any reader of this passage at Daniel Chapter 3 would know that there was a fourth person sighted by Nebuchadnezzar in the furnace along with those three, whom Nebuchadnezzar surmises as ‘Son of God’.

The same Nebuchadnezzar in a few verses below says thus:
Blessed be the God of Shadrach, Meshach, and Abednego, who hath sent his angel, and delivered his servants that trusted in him, and have changed the king’s word, and yielded their bodies.

Therefore, Nebuchadnezzar did not see GOD THE SON, rather it was an angel. Had it been an angel, why should he have been invisible to others, especially to those three?

Did the ‘Son of God’ appear to prove that there was someone who could save the three; or was it because God wanted to honour the Faith of those three?

The answer is simple, for those who want to propagate the hypothesis that ‘God humbles the proud’ the Son of God appeared only to Nebuchadnezzar and taught him that haughtiness doesn’t survive.
For those who want to exemplify that Faith in God is rewarded. Even though the presence of the Son of God, was not visible to the Faithful, the angel’s presence frightened the opponents who saw the Son of God and surrendered to those three beneficiaries of Son of God’s presence.
Either way, Shadrach, Meshach, and Abednego got the relief.

Nebuchadnezzar’s Megalomania was there to see in the way he spoke. It is the same arrogance which made him say later thus:
“Is not this great Babylon, that I have built for the house of the kingdom by the might of my power, and for the honour of my majesty?”
That the Son of God appeared in the fiery furnace to Nebuchadnezzar was a precursor to quell his teeming arrogance, yet Nebuchadnezzar wouldn’t realise. His arrogance reached such alarming levels that instead of giving all glory to God – like ‘Not unto us O, Lord!’- he wanted to appropriate all glory to himself and in no time he was consigned to be with cattle, eating grass.
Yet there was this elemental goodness in him, just as he acknowledged the God of Shadrach, Meshach, and Abednego and issued the decree that none shall utter any ill against their God, in the past. It was that elemental goodness which brought him back from those grass eating ways.