While his wings may be made of non-ferrous metals…the iron in his blood is not. Magenta has previously demonstrated that he can grip the iron fibers in blood to paralyze his foes.

Green Kryptonite has been retconned so many times it’s hard to know where to start. I like the explanation given in the Batman/Superman series a few years ago. Green kryptonite forces the solar energy out of a Kryptonian’s cells in an extremely painful manner (think all your nerves on fire) and slowly destroys them. The Kryptonian (if still alive) once out of the effect radius of the green Kryptonite will recovery with yellow sunlight replenishing in their cells. This explanation seems to fit almost every use of Kryptonite in almost every iteration from Christopher Reeve to Justice League Unlimited and more.

Silver Kryptonite is actually a magically enchanted form of kryptonite which affected Superman to make him appear high.

Um Counterpoint to your religion comment: Yes, in fact, Superman HAS inspired whole religions. He’s even had to point out to the that he’s not a god and never claimed to be!