This isn't a Christian school?
The woman had taught at a Christian school before, but browsing the school's website, I can't find anything that would indicate that this was a religious institution of any sort. Browsing the course list, which is available online, the only course with any religious content is a "world's religions" class.
The title of the thread should be changed, it's false and inflammatory.
If you read it 'Christian School' then it would be, but it's clearly supposed to read; 'School Principal, who is Christian'