What are you trying to say by posting that Scripture? That they were aliens?
Well, each of the creatures had four "faces" that happen to correspond to the cross in the Egyptian, Babylonian zoidiac: leo (lion-fire), man (Aquarius-air), ox (taurus-earth), and eagle (same as scorpio-water). I have no clue what the symbols mean, but I'm sure the Cherubim and Seraphim weren't handing out 7/11 astrological scrolls.
The "living creatures" went when the "wheels" went. Inside the wheels was a "fermament" like "the terrible crystal" - like a canopy. And one "like the Son of Man" sitting on what seems like a sapphire throne, with fire and lightning all around him. On angel of fire that does nothing but go up and down, up and down... like a piston... eyes all around it, like windows...
It's a big universe, God didn't tell us everything, and Occam's Razor states the simplist explaination is usually the right one. But, I don't know for sure - I only see a resemblance, and I'm new to the faith, so don't take my word for it.
Some more quotes that make me wonder whether we aren't the only people Jesus saved...
"And other sheep I have, which are not of this fold: them also must I bring, and they shall hear my voice, and there shall be one fold, and one shepard." (JOHN 10:16)
"And then shall appear the sign of the of the Son of man in heaven... coming in the clouds of heaven with power and great glory. And he shall send his angels with a great sound of a trumpet, and they shall gather his elect from the four winds, from one end of HEAVEN to the other." (MATT 24:30 emphasis mine)