I can imagine many people take this seriously. Many people take different religious doctrines seriously and believe they are 100% truth. Every religion can't be right. Who is to say who is right and who is wrong.

The earlier episodes of this show were easier to handled then the latest. It seems they are running out of content and are stretching very far.

I once watched this show for 5 minutes with a relative, who replied to my groaning with (paraphrasing) "The pyramids are way too big to have been built by primitive humans way back then. Why not aliens?"

>Wait, does anyone take this seriously?

Unfortunately, people have been taking this stuff seriously since Erich Von Daniken published Chariots of the Gods in the late 60s, which is how, AFAIK, the ancient astronaut meme got started.