you can't explain your reasoning, but instead cite a source of information, then your beliefs are not your own, and that is what makes you a sheep

Nothing wrong with citing sources (depending on the sources), just so long as it is not purely an appeal to authority :)

Earth was "seeded" with life from outer space

I think panspermia is highly likely, but I also think there are ample hints through history that we have been visited by someone or something, from cave wall art through to our religious texts :)