If the answer is no, this should give you pause. A thought experiment. Consider the alternatives:
(a) that we finally removed all irrationality from our understanding of reality, and you happen to be living in this golden age, while the centuries and millennia extending before you were dominated by irrationality;
(b) that it is very hard to spot irrational beliefs when you are immersed in the culture that produces them.
Which one do you figure is more probable?