Whether they were Xians is completely irrelevant. What's relevant is whether they make their scientific discoveries using "faith" (no) or using evidence (yes), and how many of them, knowing how claims are substantiated, proved the god claim (none). If any had, we would be able to easily find it in a journal. Hell, it should be on the news cycle 24/7: "True God Found, Other Religions Collapse"
If anyone should be able to validate a god, you would think a scientist would be in the best position of all. They know about defeasibility, falsifiability, reproducibility, etc, etc. Justifying ideas to further knowledge is their entire mission brief.
What you've stated isn't an argument for the validity of Xianity. Or any religious tradition. It's an argument for the inconsistency of humans, the reasons why we don't trust unchecked subjective human perception, which are things we already know, and the exact thing science seeks to solve, avoid and mitigate. It does this by having everyone else disbelieve the claim by default and accept it only to the extent the evidence supports it and the method and results can be reproduced. That's also how you get to be an atheist, by the way.
“It’s not WHAT the man of science believes that distinguishes him, but HOW and WHY he believes it.
His beliefs are tentative, not dogmatic; they are based on EVIDENCE, not on authority or intuition.”
-- Bertrand Russell
No scientist can just shrug and say "I just have faith" when their claim collapses under scrutiny. But that's the bread and butter of religious faith, which is, by definition, unreasonable, since there is no evidence that could convince a believer to abandon their belief, no way to detect an error. And since they can't all be right, most, if not all, religious faiths are in error. Religions promote as a virtue doubling down on faith when faith is not working out as preferred.
That is, religious scientists are inconsistent about how they decide what is true. That people are able to rationalize and compartmentalize inconsistent ways of viewing the world to protect emotionally-derived beliefs isn't remarkable. Rather, it's quite well understood as a family of cognitive biases (motivated reasoning, emotional reasoning, etc).
But that doesn't mean we need to endorse it or give it a free pass.
It doesn't exonerate faith and it doesn't undermine the scientific process.
Indeed, what you've said actually endorses the meme. We have only one understanding of gravity, of flight, of light, of quantum theory, etc. There are thousands of religions. A Xian (for example) scientist is able to participate in one of thousands of fractious, contentious, inconsistent superstitions, but this irrational recreational activity doesn't impede upon the consistency of human knowledge. Just like how fans can argue endlessly and absurdly over Thor's hammer, whether Han shot first, and which football team is the best, to the point of hating each other, yet those same warring tribes must set aside their irrationalities to perform science and produce knowledge that is fit to survive the ravages of scientific competition.
Think about it. People who believe that a magical space ghost made of nothing magicked everything from nothing, drowned all the babies, kittens and puppies in the world, sent two female bears to murder 42 children, birthed itself as its own meat puppet, then tricked humans into murdering it before coming back to life and flying up into the sky... are not barred from helping to put a robot on Mars, satellites in orbit, a phone in your hand, and double the human life expectancy. So long as they follow the rules of doing science. That's pretty remarkable for such a disadvantaged people to be able to contribute so much in spite of their obvious inadequacies. And it's all thanks to leaving their bible at home, not bringing it to the lab.
What is remarkable isn't that there are religious scientists, but how vastly different the demographics of believer vs non-believer are in the field of science compared to in the general population: in science it's something like (at least) 20 believer/80 non-believer. That says more than cherry-picking out any one or two or a handful of believers who have been able to cognitively quarantine their evidence-based profession from their unevidenced, unfalsifiable faith superstition. Cognitive dissonance is a real thing.