When the Founding Fathers amended the Constitution they had written, the First Amendment was intended to protect and promote freedom of religion. Today, the "establishment clause" has become a legal tool to restrict religion.
Religious freedom is being threatened by judicial activism, or the idea that the Constitution is a living document that must be interpreted according to changing times, not the Founding Fathers' "original intent." The original intent cannot be discerned anyway, the thought goes.
Affirm. Defend. Advance.