The author is conflating the culture of Christian nations a few centuries ago with the culture of Christian nations of the third century. The particular deity worshiped at the time was secondary to the actions they took.
The cultures of those two eras were entirely different.
Just as the teachings of the "fundamentalist" church I grew up in around 1970 didn't have a problem with evolution, but now that same church does, is a short term example of how religious doctrine can change.
The incredibly advanced culture of the Romans was ignored and abandoned around the same time as the adoption of Christianity. And the evidence is that if a minority of Christians have their way now, the field of science will be poisoned with the philosophy that some subjects are "too hard" for humans to find the answer, and we will give up and declare that "God did it". That is the end of science as we know it, and if you can't recognize it, then you are part of the problem.
And cultures change but underlying truths do not. Stark argues that it was the unique Christian belief in a God-given ability to reason that led to Europe's scientific domination in the world during the "Dark Ages".
And no other world civilization, or culture, advanced technically/scientifically like those with Christianity (Europe). Stark gives the evidence. Read it.
If you choose to ignore the evidence that it was all other world religions and their associated cultures/civilizations that led to an anti-science mindset and "darkness" during the "Dark Ages", and not Christianity, then your evolutionary faith provides you with a reckless tendency to revise history to favor your beliefs (and this is how evolutionists give us false feathered dinosaurs and HOX gene mutations creating limbs with hands from lobe-finned fishes).
You are speaking of strawmen, not real people...Name a Christian someone who says that "if the subject is too hard, then we will give up and declare "God did it".
Your above-mentioned personal opinion relative to Christians encountering intellectual/scientific rigor is unsupported...although I do believe that God did do it. It is just interesting to see a glimpse, via science, of just how He did it.
You, however, do make a very good religious evolutionist and Darwin Fundamentalist.