Students can already pray in school during non-instructional time.
The following is current law in the US. This is from the American Center for Law and Justice -
Prayer in School - Prayer During Non-instructional Time
Students may pray when not engaged in school activities or instruction, subject to the same rules designed to prevent material disruption of the educational program that are applied to other privately initiated expressive activities. Among other things, students may read their Bibles or other scriptures, say grace before meals, and pray or study religious materials with fellow students during recess, the lunch hour, or other non-instructional time to the same extent that they may engage in nonreligious activities. While school authorities may impose rules of order and pedagogical restrictions on student activities, they may not discriminate against student prayer or religious speech in applying such rules and restrictions.
Prayer in School - Organized Prayer Groups and Activities
Students may organize prayer groups, religious clubs, and "see you at the pole" gatherings before school to the same extent that students are permitted to organize other non-curricular student activities groups. Such groups must be given the same access to school facilities for assembling as is given to other non-curricular groups, without discrimination because of the religious content of their expression. School authorities possess substantial discretion concerning whether to permit the use of school media for student advertising or announcements regarding non-curricular activities. However, where student groups that meet for nonreligious activities are permitted to advertise or announce their meetings-for example, by advertising in a student newspaper, making announcements on a student activities bulletin board or public address system, or handing out leaflets-school authorities may not discriminate against groups who meet to pray. School authorities may disclaim sponsorship of non-curricular groups and events, provided they administer such disclaimers in a manner that neither favors nor disfavors groups that meet to engage in prayer or religious speech.
The following is current law in the US. This is from the American Center for Law and Justice -
Prayer in School - Prayer During Non-instructional Time
Students may pray when not engaged in school activities or instruction, subject to the same rules designed to prevent material disruption of the educational program that are applied to other privately initiated expressive activities. Among other things, students may read their Bibles or other scriptures, say grace before meals, and pray or study religious materials with fellow students during recess, the lunch hour, or other non-instructional time to the same extent that they may engage in nonreligious activities. While school authorities may impose rules of order and pedagogical restrictions on student activities, they may not discriminate against student prayer or religious speech in applying such rules and restrictions.
Prayer in School - Organized Prayer Groups and Activities
Students may organize prayer groups, religious clubs, and "see you at the pole" gatherings before school to the same extent that students are permitted to organize other non-curricular student activities groups. Such groups must be given the same access to school facilities for assembling as is given to other non-curricular groups, without discrimination because of the religious content of their expression. School authorities possess substantial discretion concerning whether to permit the use of school media for student advertising or announcements regarding non-curricular activities. However, where student groups that meet for nonreligious activities are permitted to advertise or announce their meetings-for example, by advertising in a student newspaper, making announcements on a student activities bulletin board or public address system, or handing out leaflets-school authorities may not discriminate against groups who meet to pray. School authorities may disclaim sponsorship of non-curricular groups and events, provided they administer such disclaimers in a manner that neither favors nor disfavors groups that meet to engage in prayer or religious speech.
You'd believe if you just opened your heart" is a terrible argument for religion. It's basically saying, "If you bias yourself enough, you can convince yourself that this is true." If religion were true, people wouldn't need faith to believe it -- it would be supported by good evidence.
