Because of its context and providence.The poster is using it in a campaign to demonstrate the wrongness of Christianity and the improved mental capabilities of those who reject it. Unless I'm much mistaken.
You're very much mistaken, but eh, what's new.
The context is that it's a factual news story about religion on a religion and ethics forum.
I don't know what on earth you mean by 'providence'; perhaps you meant
provenance. In which case, it comes from itv.com, who I believe are known to report news stories from time to time.
These head-desk howlers aside, your most egregious error of course is thinking that the posting of a factual news story equals an argument of some kind instead of the provision of information, hence your absurd invocation of the
argumentum ad populum fallacy even though it's absolutely nothing of the kind.