Batley Grammar School has delayed starting school on Thursday until 10am over the “disturbance”.
A message circulating on social media on Wednesday evening urged to people to gather outside the school and demand the resignation of the teacher allegedly involved.
Headteacher Gary Kibble apologised for the “inappropriate” resource used in the lesson.
He said in a statement: “The school would like to thank the parents who contacted us on March 22 highlighting concerns with a resource used in an RS lesson that day.
“Upon investigation, it was clear that the resource used in the lesson was completely inappropriate and had the capacity to cause great offence to members of our school community for which we would like to offer a sincere and full apology.”
The school has sent out a text message to parents to advise them of the delayed start to the day for pupils.
It says: “Due to the disturbance outside of school if your child has not already set off please keep them at home as school will be starting at 10am.”
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