Unless parents object, teachers in the government school system may present instruction on virtues and religion. This is a wonderful opportunity for children to develop good character. 

Education on virtues and religion can include appropriate instruction in the areas of academics, religious history, holidays, literature, symbols, music, art, drama, outside speakers, use of school facilities, clothing and jewelry. For more information, see The Rights of Christian Teachers in Public Education.

Teachers in public schools should also be aware of their right to stop the union from spending their dues on objectionable political purposes. 

It is frequently the habit of unions to spend dues supporting anti-family candidates and ballot measures. Yet average teachers don't know they are facilitating anti-family values or how to resign from the union to protect their money and their conscience.

Learn more about your rights as a teacher:

Teachers’ Rights on Public School Campuses

Teacher's Rights (A Short History)

Understand your right to stop the union from using your money for politics:

How Can I Resign My Union Membership?

How Do I Cut Off the Use of My Dues for Politics and Other Nonbargaining Activities?