No, Kipple, not necessarily at all. And I've noticed some of it depends upon the "type" of science they teach. When I was in high school, I had 2 science teachers that were very devoted to the Lord. :-)
How do you come to the conclusion that science people are likely to be atheists? That's ridiculous, that's the same mentality as thinking people with blue eyes are more likely to be criminals. If your teacher were a scientologist then it'd make more sense.
Youd have to ask him/her. Teachers have to teach the curriculum given to them by the school system. Theres a good chance he/she is an athiest but he/she might not be. Religious people do teach science. Not every religious person hates science. Much of what science teaches is true anyhow. The only real issues rise in the teaching of the THEORY of Evolution and then only because its required to be taught as fact rather than as what it is - one theory among several.
No way to tell, since public school teachers are not allowed to talk about their religious beliefs (nor should they), and certainly not all scientists are atheists.
I am both a scientist and an atheist, and while a large majority of my colleagues tend to be atheist or agnostic, there are some religious too. Not every theist is a science denier.
Of course, high school level teachers don't even necessarily have to have that many college level courses in the subjects they teach, depending on the state, so they aren't as likely as those of us with advanced degrees in the sciences to be atheists.
You can't really apply average statistics to individual people either.
Like JamesKaeberle said, if you need to know, ask. But I wouldn't simply ask, "Are you an atheist?" I would suggest something a bit more neutral like "Would you care to share whether or not you have any religious affiliation or beliefs?" It may be that teacher may feel uncomfortable about sharing that information with a student, but it won't be held against you for asking. But were I that teacher, my response would be to first ask, "Why do you ask?" You should be ready to state your case in the event that is his or her response.
My biology professor believes in god- but then again, he'd probably find as ridiculous as I would if you claimed evolution was fake. In fact he left his church because his pastor made that claim with no evidence.