They've got some interesting ideas and it does make you wonder but there simply isn't enough evidence that there are or ever were alien beings, let alone ones that are capable on inter-stellar travel. But it's interesting to think about. Maybe there were beings such as that and early man confused them for Gods. It would finally make sense of so many mysteries about our ancient world. But... that might just be trying to create an answer to make the pieces fit... just like creating a God.
"If you canít take a little bloody nose, maybe you ought to go back home and crawl under your bed. Itís not safe out here. Itís wondrous, with treasures to satiate desires both subtle and gross. But itís not for the timid."