Creationists are either stupid or think stupidity is funny.

Honestly? Lungs evolve from gas bladders. Gas bladders store air and control the buoyancy of a fish. Feet from the fins typically with a lot of strengthening for basic locomotion. Also, at around this time insects were already widespread on the land and mosses and very basic plants were abound. So we have land filled with very tasty spiders and an ocean filled with predators and people have the idiotic nonsensical belief that short excursions on to land are somehow impossible to evolve gradually. You can't evolve inroads to a completely untapped niche safe from all predators! That's impossible.