OK, I'm a conservative Christian, maybe I'm biased. But it set off my BS detector even then.
As did some other BS stuff I read, such as the book “the First Sex” by Davis. I couldn't explain why it was BS exactly, because in those days I though professors sought the truth. I have better tools to do that now.
Nevertheless, a minimally logical mind could determine that conclusions were being drawn that weren't supported by the evidence presented.
And that was enough for me.
I once pi$$ed off my academic advisor (a professor of Ottoman History, and a good one) by replying to his opinion that I could go for a PhD in History, i.e. follow his career path into the Ivory Tower, by telling him I was not inclined to join the priesthood. I don’t think he ever forgave me for that quip, but the pretensions of intellectual loftiness characteristic of that class always rubbed me the wrong way.