Schrödinger was a real and very eminent scientist, one who has staked their place in the history of science.
Sagan, while he did a little bit of useful work on planetary science early in his career, quickly descended into the realm of (self-promotional) pseudo-science. This was his fanciful search for 'extra-terrestrial intelligence'. So it's apposite that you bring him up (even if the quote you bring is a big miss against a philosophical statement), because his belief in such an 'ET' intelligence was a fantasy as much as the belief in the possibility of creating an artificial intelligence is.
While I do hold that Schrödinger was a giant of his field, let’s not forget about the Nobel disease. Blind appeal to authority does no good.
- Carl Sagan