Belief in the religious sense or in something supernatural often requires no
evidence at all.

or aliens.

It's also based on anecdotal evidence, witness testimony and to some
extent even physical evidence.

There is anecdotal 'evidence' that Thor makes the thunder and
lightning.

But Thor is a supernatural being. ETs are not supernatural.

are you sure?
ever found one?
so the chance they are supernatural is far greater than not.

No the evidence exists. if you approach the evidence with an open mind
without preconceived ideas, the truth really is out there and is open to any
one who care to seek it out.

no you except only your own truth,except aliens visiting us,nothing else,i see no aliens and now i have a "closed mind".
a typical response from believers.