I don't blame you for being angry! That is sneaky, underhanded indoctrination!
This really highlights why I believe education and religion should be separate. Your child has been taught something not in the syllabus, against your knowledge, and against your own belief system.
I do have personal religious beliefs. But they are mine. I do not believe in forcing them on people. Especially other people's kids. If people ask, I will tell them. If they don't, that is ok.
Situations such as the one you describe do little but reinforce negative perceptions of religion!
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