The problem with creationists isn't that the viewpoint is only supported by a few, but rather that their methodology is a combination of faulty and completely lacking. I don't know enough about the mythicists to say whether they fall into the same illogical pitfalls.
That said, the existence of a real Jesus has no real bearing on atheism because it doesn't make it more plausible that he actually was a magic zombie. I mean, I guess it'd be nice to go "Ha ha! He never actually existed in the first place!" But from a practical standpoint it doesn't really matter. It isn't the mundane life and death of Jesus that matters but his supposed miracles and resurrection. A real guy doesn't make any of that more likely (cue the ghost of Randy and his five minimal bullshits).
That said, the existence of a real Jesus has no real bearing on atheism because it doesn't make it more plausible that he actually was a magic zombie. I mean, I guess it'd be nice to go "Ha ha! He never actually existed in the first place!" But from a practical standpoint it doesn't really matter. It isn't the mundane life and death of Jesus that matters but his supposed miracles and resurrection. A real guy doesn't make any of that more likely (cue the ghost of Randy and his five minimal bullshits).
"I was thirsty for everything, but blood wasn't my style" - Live, "Voodoo Lady"