The very fact that you're implying that being smart and believing in God are somehow contradictory reeks of condescension. Not to mention that you're grouping all religious doctrine for all religions into a "fairy tale" bucket shows that you did not spend time or effort understanding at least the existing major religions on Earth.
Don't leave us hanging like that. Which major religions do you personally consider not to be a fairy tale? Please also include, for each such religion, if you happen to believe in it, and whether it was the religion you grew up with (if applicable).
No. There are stupid people at Google too. It's a company and the hiring bar is high but it's also very specific. You can be an idiot in most things but still be very good at one. I've know a few. At Google.
There have also been hires that were "good demographics." (That's a quote from one of my senior leadership at the time I worked there.) Sometimes you can be rejected by all the interviewers and still make it.
For those who don't believe in religious doctrine, it is the same as believing in fairy tails. They come with equivalent amounts of proof and stand up to the same level of scrutiny.