This is about the practice, not the practitioners.

When I read your message, my takeaway is, "Science as a process is so reliable that you can take irrational beings who believe in a ghost father, teach them the scientific method and generate provable rational outcomes that yield progress."

The rational 'machine' is what matters, I could not care less about the irrational thoughts of the 'gears'.

TLDR, People are irrational, yep, even scientists. Thank goodness even irrational beings can follow a rational process.