Dr. Ammon's teaching is in line with the scant bit of Ancient Religion teaching I received at University. That teacher, Dr. David Ulansey was also an expert on Greek and specialized in the Mithraic Cult.
Basically, it is my understanding that if one knows ancient Greek then one can understand what was really happening in these cults. If you rely on these shitty translations then you're just in a modern cult and you really don't anything.