"Atlantis is merely an interesting possibility at this point"
That's where you're wrong... there is NO possibility that "Atlantis" ever existed, as referenced by Plato... He was writing fiction, as social commentary, and as satire....

"Jesus is an interesting possibility too, and admit "he might have existed"
By that thinking ALL things are interesting possibilities, and might have existed... Which might be cute in an imaginative 4 year old girl, but isn't go do anything to put food on the table, or get a stuck cow out of a bog.