What could be their motivation in jumping into a thread about God, who they claim doesn’t exist? Why are they so drawn to a belief system they totally disagree with?
Here is your answer, esp vs 17 & 18.
Romans 3:10-18 It's the condition of unregenerate humanity.
10 As it is written: There is none righteous, no, not one; 11 There is none who understands; There is none who seeks after God. 12 They have all turned aside; They have together become unprofitable; There is none who does good, no, not one. 13 Their throat is an open tomb; With their tongues they have practiced deceit”; “The poison of asps is under their lips”; 14 Whose mouth is full of cursing and bitterness. 15 Their feet are swift to shed blood; 16 Destruction and misery are in their ways; 17 And the way of peace they have not known. 18 There is no fear of God before their eyes.