I'm assuming when you say "believing in science", you mean believing in evolution, the big bang, etc. as opposed to a God or Deity creating the universe/humans/whatever.
In that case, would "Atheist" not be the proper term?
Science can't be practiced like religion >.>
There no prayer to the great science :|
Science is only a big amount of knowledge
Well that's as far as I know
So, Atheist?