It seems that non-Christian views are welcome, but Christians are treated like lepers or nonentities, that must be shunned and silenced. Don't allow these groups to silence you. Christians are citizens and taxpayers like everyone else. Don't hesitate to seek legal advise from them. These groups are more than willing to defend religious liberties protected by our constitution.
Christians are also human and make mistakes.
Sometimes they have good ideas and sometimes bad. But school officials should have an open ear to your concerns and should not pre-judge you because of your religious background. Always be courteous and respectful of school officials, politicians and even those who disagree with you. Be well informed. Know the facts.