I see. That theory does not require the Atlanteans to be aliens, though. They could have been an advanced culture of humans. I believe there was an advanced culture that was wiped out in some kind of cataclysm. There is plenty of evidence for this. However, i see nothing that requires the intervention of aliens.

Of course, there are plenty of groups which believe that Jesus is an ascended master. Plenty of people believe God is an alien. Who knows?