Very kind of you. And you're right; people really do sign stuff all the time without reading it (including when they register at DP). I have no idea whether this is a Whitefield Academy requirement, but many schools do require students and parents to sign conduct contracts.
And these parents surely heard of this school because of its reputation. It wasn't a random choice. The handbook explicitly states that the school and the parents work together. This is the first item under General Disciplinary Policies:
Role of the Christian School
Whitefield Academy’s Biblical role is to work in conjunction with the home to mold students to be Christlike. On occasion, the atmosphere or conduct within a particular home may be counter or in opposition to the Biblical lifestyle the school teaches. This includes, but is not limited to, sexual immorality, homosexual orientation, or the inability to support Biblical standards of right and wrong (Rom. 1:18-32, I Cor. 6:9). If the home environment is not in harmony with the school’s doctrinal belief in the centrality of Jesus Christ and the authority of Scripture and Biblical lifestyle, it will be difficult for the school to cooperate with the home and achieve the goal of a student becoming Christ-like. In such cases, the school reserves the right, within its sole discretion, to refuse admission of an applicant or to discontinue enrollment of a student.
https://www.debatepolitics.com/brea...w-sweater-her-birthday-67.html#post1071190401
Although I mainly attended public schools, I was graduated from a Sacred Heart school. Explicitly Roman Catholic, and then and now, irrespective of a student's religious faith or its lack, she goes to school Masses. Buddhist, Muslim Taoist, Jewish, whatever, she goes. The uniform code must be followed. However poorly, the student will study French. Parents know this. And as always, ignorance of the law is no excuse.