One way to stop this is to exert your power as parents.
Organize a school of your own. First, you meet with all the parents who want to get Islam out of the school (some of this must be done in as secret a way as possible). Then, you organize a new plan - set up homes where children can be taught the truth (using parents who don’t work and who are willing to be teachers); organize after school activities (maybe get some of the dads involved); meet regularly to keep track of how the children are doing; and then .... after you have kept your children out of school for several weeks (hopefully most of the students in the school), you present your plan to the school - NO ISLAM TEACHING IN THE SCHOOL.
This works, because when the children don’t show up, THE SCHOOL LOSES TONS OF CASH. The cash comes from the fee the feds pay to the school for each child WHO ATTENDS. No attendance means .... NO MONEY.
It’s a very good bet the school will change their minds, and then all you have to do is have a committee of several people who will regularly DROP IN (unannounced) to several classes just to keep the school honest.
It has worked before .. and I have no doubt it will continue to work .. because the goal is to get MONEY.
This is a good idea. Just keep in mind that this administration has already threatened teachers (through districts) who are speaking out against common core.
It will take a movement (many people) to defeat their agenda.