i believe
dnpante's reliance on the same provision (Section 3[3], Article XIV, Constitution), is the better basis for answering subquestion (b).
i also think that the equal protection clause may be invoked as a supplementary argument.
Some points, however:
1. The provision (Section 3[3], Article XIV, Constitution) states:
Quote:
At the option expressed in writing by the parents or guardians, religion shall be allowed to be taught to their children or wards in public elementary and high schools within regular class hours by instructors designated or approved by the the religious authorities of the religion to which the children or ward belong, without additional cost to the government.
Thus, it seems that if the parents or guardians request the giving of religious instruction to their children or wards, then the school has the duty to allow their children to have such instruction. The denial by the principal of the parents' request violates the above provision.
The principal's action also contravenes Section 5, Article III. In particular, he/she violated the non-establishment clause by showing a preference for a specific religion. He/she also breached the free exercise clause by prohibiting the giving of religious instruction to the evangelical Christian students.
2. The provision seems to provide that the initiative should come from the parents or guardians. If this reading is correct, would not the action of the principal (writing a letter to the parents thereby taking the initiative on religious matters) be invalid? Would it not constitute a violation of government neutrality on religious matters? In particular, would it not show preference for one religion over another as the offer was favorable to Catholic students only? Does this not aid religion and, worse, a single religion at that?