I beleive there is a possibily of life elsewhere in the universe, but i don't beleive anyone on earth has ever seen an alien (or an alien spacecraft). I think that UFO sighting are much more likely to be down to human error, exaggeration, or simply lies.
I mean, let's think about it... Why would an alien craft would come all the way to Earth.
To make contact with us or be our friends? Then why haven't they done it, after so many 'visits' ?
Just to take a look at us? This doesn't make sense, because an alien race that has the technology to reach us would surely do so without being seen.
To conquer us? So why haven't they done it, after so many 'visits' ?
As for angels: i can catagorically state as a fact that there are no such things, coz i never seen one