This type of reasoning is in my mind a typical expression of how mere cultural values create an unhealthy bias. It is similar in this respect to how the Inuit might consider whale flubber a great delicacy, or a Swede might enjoy fermented herring, whereas everyone else looks on in distaste, and will tend to express their dislike in universal terms.
That is not the same you might argue, and you'd be right of course. But there are so many overlaps that is certainly motivated to call it similar: We are weaned into a secular disdain for religion - at least in many parts of the world - just as the Inuit are weaned into their food culture. It is not primarily a function of our superior intellect that we look down on religion, it is a function of our age and time. We will eventually abandon our present hubris for something else, just as people under the monotheistic era departed from the previous animistic and polytheistic beliefs.
So what is unhealthy about it? wasn't the monotheistic religions a big step forward that allowed for greater societal cohesion and (in most places) a rule of law? Isn't a secular society a much better place than before, where beliefs are not passed down from above in a unintelligible language and jealously guarded by the elites that profited from the system?
Well the key term is probably "step forward" as opposed to right and wrong. It is not like the Inuits are wrong in their eating habits - but uninformed and biased people might be prone to think so. It is not like the polytheists were wrong, in spite of the persecution they endured. And it is not like we are right in our present thinking either - a step forward in many respects, yes. But we will one day also be ridiculed for our primitive assumptions about reality - by the biased people of the future.
Provided we all survive the present at all, our present and ubiquitous self-righteousness sure looks poised to snuff out whatever future we may dream of.