I can't be certain, but I don't know if the artists is actually referring to a belief in aliens. This is a reference to the 90ies show The X-Files. The image and text "I want to believe" is on a poster in one of the main characters' office.
Now, that's not to say the artist doesn't believe in aliens. They could.
Now, that's not to say the artist doesn't believe in aliens. They could.