In High School we had a religious studies teacher who's favourite saying was that the Bible was "99% fiction and 1% fact" and set homework like explaining how the twelve plagues of Egypt happened without any divine intervention. Which I still think was quite out of order; however, in terms of systematic bias you have to set that against a background of Christian speakers invited to speak at school assemblies and all the other religious studies teachers.
Our Biology teacher was rude about Creationism - fair enough, really.
When doing a residential school for my OU course one of our tutor's was openly rude about religion - IIRC, he referred to God as being an "imaginary friend". I thought that was out of order.
So, I would say that there are teachers, tutors and lecturers out there who will inappropriately inject their atheist views into their teaching but it's hardly systematic and must be balanced against a wide spread of religious teachers, tutors and lecturers who inject religion into theirs.
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