Controversial just means the topic to be in dispute. It is a question of semantics and precision of language. In that regard the flag on a wiki site is certainly justified.
Because that isn't comparable. Evolution is controversial because it collides with a lot of other beliefs. Particle physics and gravity generally don't, if only because people aren't familiar with the intrinsics...
All of genesis? Young earth specifically (unless Christian's god created the moon with initial velocity).
I've read an article from a Hindi that basically explained how their religion was much more science-proof than the monotheisms. Also, looking into Ramadan for weird reasons, I recently found an article about how the Coran was more scientific-friendly than the bible, with example from the new testament.
Both where cherry picked bull* but I should have kept the links, it was quite fun and I probably would have had more examples.