"And who said I was an atheist? Ive not made such a claim. I've said nothing about my personal beliefs but you can bet I'm not a young earther or a creationist."
A creationist, by definition, is someone who believes in a Creator. So if you're not a creationist, that makes you an atheist. (Unless you're trying to say you're an agnostic which is really just a weak form of atheism according to the New Atheists.)
"why would any atheist automatically believe in aliens? Thats just silly talking best. eally scraping the barrel there accusing people of believing in aliens with no evidence at all. As well as lumping atheists into a homogenous group."
I said "if" you're an atheist and I didn't say "automatically" I said "probably." When I make these claims, I'm referring to people who have thought through their worldview to make it logically consistent (like I have). The problem comes in because most people haven't.
Atheists believe that life arose spontaneously from non-living material either on this earth or on another planet which was then seeded onto earth. Because, so the argument goes, earth is not special (see the Copernican principle) there are likely many earth-like planets in the universe capable of supporting life. And because our sun is a relatively young star and there are probably trillion of other solar systems out there much older than ours, the chances are great that there exists life and possibly advanced life on at least one if not many other planets in the universe.
This is the argument I accepted and preached up until about 4 years ago. My favourite arguments was, "We'd be arrogant to think that we are alone in the universe." That was until I learned that, according to the best scientific evidence, the earth actually is quite rare and special in the universe and that the chances of life coming from non-life without a Creator are so remote as to be in the realm of impossibility.
This is why most atheists, if they are logically consistent in their thinking, believe that the existence of aliens is quite probable. Stephen Hawking himself said recently that they may even walk among us now and if you meet an alien, you should avoid talking to him because he's probably dangerous.