Engineers knew about the xenomorph

LouisPasmans
MemberOvomorphJune 01, 20121022 Views15 RepliesATTENTION SPOILERS! For the people who haven't seen the movie yet!
So... I saw the movie yesterday and in all honesty I loved the film! It was everything I expected it to be! Ok it had some flaws but overall it was a great film! But after a night sleep i came to realize that the xeno that is born out of the engineer is exactly the same as the xeno we see in the mural in the place where the big head is! Like they said it's a sort of temple where all the murals are.
Did they worship the xeno's? Why make a mural out of it?
Or did the temple make the mural out of it self? Because the murals change when the atmosphere is affected? This could mean that a xeno might have been there in the temple and affected the atmosphere which would be the explanation why the engineers were running away and it also explains why the big pile of dead engineers have exploded chest holes!
Shaw also said that the Engineer who was beheaded died about 2000 years ago! Meaning that the xeno mural was over 2000 years. Also note that the engineers wanted to attack earth 2000 years ago meaning that something happened 2000 years ago that really pissed the engineers off! (Jesus perhaps :P)
What are your thoughts about this!