I believe there are aliens out there, call it a statistical thing (you know, billions of planets, gotta be some aliens somewhere); probably why I love science fiction so much 
I also accept that the only place we know life exists is here, on Earth although that is no reason to stop looking.
IMO, anyone who claims to believe aliens have visited Earth does so as a matter of faith… beyond that, I’m not sure there’s anything much else to say.
UK Atheist