A) The purpose of these references is to underscore that the Lord God is coming to pass judgment, and He will execute that judgment on everyone. There are two major points to note: firstly, the Lord is coming, and He is on His way, regardless of whether you believe He is or not. He will come collectively, but before that, He will come for individuals. Secondly, when He comes, there will be a significant amount of judgment. Everyone, to some extent, will stand before the Lord and be held accountable.

B) There is a difference between judgment for all, BUT conviction for the ungodly. 

C) Also worth noting is the reality that God will judge everyone who has spoken harshly against Him. Those who speak about God in a dismissive manner will discover that their words will come back to haunt them. There are no atheists in foxholes, and there will be no atheists when someone stands before God either.