That is a good start because evolution is a finite sequence of non-zero-probablity events.
Having Earth in orbit around Saturn until recent times pretty much hits the jackpot when it comes to a zero-probability event. Besides the fact that Saturn is very far from the Sun's habitability zone that it would be too cold to support life as we know it. Additionally, Saturn is a source of life-zapping radiation which would quickly kill off life as we know it. Finally, for the Earth to be close enough to Saturn for the latter's gravity to reduce the Earth's by the third you've postulated in the past, the tidal forces alone would tear the Earth apart.
It's a good thing you don't lobby for Saturnianism to be taught in schools -- a high school physics student could take it apart in minutes. On the other hand, evolution, that big bugaboo of your existence, is the best theory going to explain life as we know it. It must really stick in your craw that the evidence does nothing but support evolution -- oh, I forgot. You believe there is a Grand Conspiracy to suppress the Real Evidence (you've never quite explained WHY they'd try to suppress evidence that would win them all Nobel Prizes, but then again, conspiracy theories do not need to make sense, do they?).