The moment you measure the dance... you have interjected some distortion - Not to the dance, though. The fish won't differ from being looked at or not. Your representation OF that dance will be distorted from "reality" by your perceptual system, expectations, etc. - but the fish just dances on.

There are many 'religionists' who are perfectly capable of discussing their beliefs calmly and in a rational way. - Sure - but their faith itself is NOT rational. (Almost by definition.)

And the growing evidence is that the Darwinian advantages of religion accrue to the PRIESTHOOD (loosely speaking), not to the believers upon whom they prey.