LOL, I had the same impression about The Tudors: some very odd casting, silly costumes, pointless gratuitous sex. It seems to me that Wolf Hall at least attempted to be more authentic.
It still boggles my mind to think that world Christianity (and the history of the world, really) were profoundly changed just because Henry the Eighth wanted a divorce.
It was a bit more complicated than that. Also Protestantism was already on the rise and established in German, Switzerland and Scandinavia before Henry VIII split with Rome. It was also rising in Scotland.
Harmless Teddy Bear does a pretty good job at post #59 of explaining the chain of events that led up to it.