Atheists claim different statements like: "there are no gods", "there is no a certain god", etc.
Definitely it is impossible to maintain negative statements, so no sane persons would claim "there are no pink frogs". Yeah, probably, we cannot find them right now, yet it still is possible to meet them in future somewhere.
The second claim supposes that there might still be some other gods. If an atheist reject that Thor exists there still might be found Buddha or Zeus. Moreover, there are no fully competitive person who dares to claim he knows everything about God, and that's why an atheistic argument fails.
Two points of them are ruined, I guess the similar claims of them can be destroyed easily too, because the other arguments are narrower versions of that two above.