Oh, it's a hoot since most, after spending their entire lives on this planet, can't even ID earth's closest planetary neighbors in the night sky. In fact, most when they see the "Milky Way" in the night sky, have no idea it's actually part of their own home galaxy...Ya it's hoot IMO.
You say those same billions of people don't believe intelligent life exists on billions of other planets in our galaxy?
Considering the intelligence level of most people in regards the universe, or our galaxy, it would seem to call into question their beliefs and or opinions. In fact would it not seem to undermine their credibility?
It's easy to disprove most or billions don't believe? Maybe, but I've never seen a world wide survey.
But the fact is, everything considered, and based on the above, what the typical person believes regarding life on other plants, does not impress and is basically meaningless.
BTW, don't know about you, but most people I know, including myself, who have an above average understanding regarding the enormity of the universe and our galaxy, believe there is life out there, beyond our tiny world.
BTW, ya ever seen an astronomy thread here? It's quite amusing when Nebula pics are compared to a bowl of Jello or a taco.
Take care.