You have to ignore the herd mentality, they believe they know everything.
They think that there is other life out there somewhere but are too stupid to be able to find it.
They think that science is so superior, but yet they cannot create life from nothing.
Not all people who accept science believe that there's life elsewhere in the universe. At the very least, I know I'm not certain about such an assumption due to the lack of definite evidence, even though I personally lean toward there being life on other planets.
Also, I honestly don't see how "accepting modern science is a more rational stance than rejecting it" logically leads to "we must be able to create life from nothing." Accepting modern science doesn't mean one has to view it as capable of achieving everything we can think of.