Do you beleave in Aliens ?

Short answer. Yes.
Loong answer: There is definitely more going on in the universe than we know, so to think there is no other life seems unrealistic. Especially when we continue to discover 'new' critters that live or lived on earth, mostly in the oceans.
Intelligence is a relative term. Even among humans, intelligence levels can be much different. Not just a matter of how 'smart' someone is but in understanding concepts. So how do we know if something evolved when so many levels exist simultaniously? I don't think we have evolved in the last few thousand years (maybe learned a few things). Did God create us (and the aliens)? Perhaps. I find it hard to believe everything we know (and so much more that we don't) happened by chance.
I remember seeing a 'UFO' back in the 70's. Strange light pattern, moved different than anything I knew, etc. So by definitition it was Unidentified. Aliens? Don't know.