I found this epsiode enjoyable fun. I'd never thought about much deeper because it's played as pretty much a fun episode throughout. Sometimes not everything has to be complicated or deep.
Sexist? I don't see this, and I feel I'm missing something in the review backing this up.
And again I don't see the episode as looking down on faith. Trek is full of diverse races, some who are religious, some not, and some who are nieve. This one is nieve and impressed by what is obviously impressive technology. If earthquakes are racking your world, you're going to be scared of the person that's doing it.
And to echo Dorkboy, with all the talk of TOS I'm surprised that MEG didn't note this was a script from the aborted Star Trek Phase 2 -- to an extent, it is out of its time.