Jer 25:8
Therefore thus saith the LORD of hosts; Because ye have not heard my words, Behold, I will send and take all the families of the north, saith the LORD, and Nebuchadrezzar the king of Babylon, my servant...
My point of view.
God would use a heathen to do his work. Hs is sovereign, He do whatever He wants. Nebuchadnezzar, at that time, did not know that THIS God existed. He had his own idol god. Yet, God still used him, referred to him as his servant.
If God would use a heathen king to take down the Chosen people, then I would imagine that He could use an atheist to make a record, if that is what He wants to do...
Thank the Lord that God finally converted Neb, like Apostle Paul. Read Daniel 4. That is Nebuchadnezzar witnessing to the whole world of who the God of Daniel is.
Da 4:34
And at the end of the days I Nebuchadnezzar lifted up mine eyes unto heaven, and mine understanding returned unto me, and I blessed the most High, and I praised and honoured him that liveth for ever, whose dominion is an everlasting dominion, and his kingdom is from generation to generation...
Da 4:35
... he doeth according to his will in the army of heaven, and among the inhabitants of the earth: and none can stay his hand, or say unto him, What doest thou
Da 4:37
Now I Nebuchadnezzar praise and extol and honour the King of heaven, all whose works are truth, and his ways judgment...