I see the point your making, but we shouldn't discount that many Christian's beliefs/faith are based on personal experience and not solely Biblical testimony.
That's a good point, and I agree. but it doesn't really change anything.
The claim was that those scientists who witnessed x are few in number and in an elite position to evaluate the evidence. I agree with that since I have not (could not) do the work, myself. But I accept their witness that the observations have been made and calculations have been done as a credible witness. And I accept it because it is a live option for being disproven. I'm an idiot, but there are others that can disprove it, and they also agree.
Part of what makes Christian faith an act of faith is because, as things stand now, the witness of the apostles to the resurrection, and the Holy Spirit's witness to us, cannot be disproven. We'll see one day, perhaps, but such claims are not up for observation, experiment, verification. The distance of stars, however, is a live option for being disproven. There is a lot of faith involved with science, thats true, but it's a different kind because it's a community dealing with empirical, verifiable evidence.
So I think it is still the case that if one can accept the apostolic/Holy Spirit's witness, granting credulity to well worn scientific claims should be a no brainer.
Which is more worthy of being believed based on testimony? That which can neither be proven nor disproven or that which could be disproven, has been tested, and still stands? I say the latter. That doesn't mean the former is not worthy of credulity, but the latter is much easier to accept and should be a non-issue.