And the evidence is?
Faith. Thinking freely, unfettered by superstition.
“And the evidence is?”
There are many people who claim to have been contacted by aliens.
This podcast has a bunch of them:
https://podbay.fm/p/aliens-and-artists
That counts as “evidence” to me.
If it is not persuasive to you that is your call—I cannot make you believe what you do not want to believe.