@Luman, I consider myself agnostic, because I accept that I cannot know why I am, or what becomes of me when I am not.
In the case of this meme however, I'm quite certain it is addressing the
de facto definition of an atheist, who in most cases would assert that "there is/are no God(s)" (whether believed to exist by an organised/conventional religion, or not), and while I don't rule it out, I feel that those who state it with absolute certainty are even less credible than those who are stubbornly convinced of the opposite.
"The science" (that those who refute the existence of (a) God(s) draw the entirety of their beliefs from) has already been done on this, and the chances of life occurring
randomly were estimated to be around
1 in 10^40000. To give some perspective: that would be like
one person (in their lifetime) winning the lottery jackpot
10^3990 times (and that's an underestimate). Put simply, I have more chance of waking up tomorrow, tinnitus free, with the ability to fire destructive laser beams from my fingertips.
So if we are to believe the above given scenario to be "impossible", then we would have to conclude that our existence upon this earth being a
mere fluke, is also "impossible"; thus an atheist must acknowledge themselves and their being, according to the laws of probability, to be an
anomaly, or put another way,
"irrational".