[jsean]

I pretty much agree with what you've said. Although, regarding "I ask them then that by the same logic, out of the billions of species that have existed on this planet there's gotta be more species like us doing the same things that we do?" My answer would be - sound logic but flawed line of thought. Since all billion species here on earth are confined in this well connected area it means, all billion species pretty much have been and still are competing with each others and amongst themselves. Meaning there can in the end only be one winner (following some sort of law of the jungle). The winner gets to type these words.

If we assume "since space is vast, there's gotta be a planet somewhere that has similar environment like Earth and thus similar life forms inhabiting it" we can regard each of those planets as completely separate competitions and thus there can be as many winners as there are "similar environments"