They think they know something for a fact, when it is actually just their opinion (i.e. the existence of God).
Claiming there is no God is an extraordinary claim, yet they have no proof.
Since you like aphorisms, here's one that applies to this situation: "absence of evidence is not evidence of absence."
I said that there is every reason to believe that the same conditions that existed here on Earth that created life almost certainly exist else where in the universe as well as the possibility of sentient life. What I said and I will repeat, by the laws of physics known to us inter galactic and interstellar space travel is a virtual impossibility and UFO and ‘’little green men’ are hokum. Prove to me otherwise. You have yet to do that.
However, I think their 'grokker' is broken.
However, I'm happy to take the opportunity afforded by said toying to keep the thread bumped. It may wake some folks up and spare them unnecessary suffering and/or danger.