The phrase is a common criticism by Christians of other slightly different Christians. From an outside view, of course, the difference just looks like one of selection.

I have no idea where I adapted the text from. I wrote it a few years ago, found it again recently and went "where the heck did I get that from?" Creationist and Conservapedia sentences, I think, adapted, exaggerated and strung together.

The intended takeaway is "There is no shortage of rationalists using [label] as a proxy for their own beliefs" and an implied "don't be one" :-)