If you can’t change what the textbooks say about Islam, most school offer the option to op-out of the objectionable religious instruction.  Seem on my previous posts today, there are Districts Policies that permit this to be done.  Go to your School District website. Click on School Board Policies. First look under programs. If a policy on Excuse from Religious Instruction is not there, search all the other categories.  Most States require a similar policy.