Even a breakaway civilization of ancient Atlaneans living under Antarctica makes more sense than aliens. Do yourself a favor and look up how far away other stars are, consider how many times astronomers have looked into space and not seen aliens, and then ask yourself why aliens would be so good at cloaking themselves in space but would ostensibly let themselves be seen on Earth itself.
Spoilers: it's not Atlanteans either, it's just a big tangle of hoaxes and self-delusion from people who want to believe.
>The main argument in favour of the non-existence of aliens are religious books.
Not in the slightest, that's the worst strawman against it (and for the record, I am an atheist, so drop this line of argument now before I'm forced to counter-insult you.) Try the Rare Earth Hypothesis. There are only 10^11 stars in the Milky Way galaxy, you don't need to stack up many terms in a "Drake equation" to push the result to near zero in the Milky Way. The Rare Earth Hypothesis is consistent with all empirical observations thusfar.
Furthermore, even if there were other intelligence species like us in our Galaxy, they would be incapable of reaching us just as we are incapable of reaching them. To believe these aliens are visiting Earth you need to explain why you can't see them anywhere except ostensibly in deserts above American military facilities and installations for testing secret aircraft.
>To believe these aliens are visiting Earth you need to explain why you can't see them anywhere except ostensibly in deserts above American military facilities and installations for testing secret aircraft.
FWIW, I think this is a much stronger argument against the existence of aliens than “they don’t fit with our current understanding of physics (which is known to be incomplete anyway)”.
We don’t need to actually see the surface of a planet to know whether or not that planet harbours life capable of space travel depending how far away the planet is.
Unless they took a completely different, or radically faster pathway to interstellar travel.
Spoilers: it's not Atlanteans either, it's just a big tangle of hoaxes and self-delusion from people who want to believe.