Young children are very impressionable and have the view that what the teacher says is true. So if they are introduced to religion at an early age, it might not be in accordance with the parents wishes. You can't possible expect to teach young children about all the major religions. So my suggestion is to wait until these children become adolescents and more capable of understanding. Even then I believe they should only learn the basics of the religions and not a "study" (and only if the parents/student agree).

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