Regardless if you are a religious teacher or not, being a teacher is a great responsibility. Its one of the most underestimated and underpaid jobs there is. The effort it takes to be a good teacher is crazy.
Something that also plays a part is being a teacher is where you are teaching. For example public schools may be more difficult because the classes are bigger and the kids may be ruder. But in a private school the classes might be smaller and the kids might be kinder. So that might be easier to handle. Usually the student to teacher ratio is smaller in private schools, which may enable a better learning environment for the students.  In my opinion I think that Christian schools are the best because they give more then just education, they provide you with solid a foundation.