Article 6 (...) (2) The care and upbringing of children is the natural right of parents and a duty primarily incumbent upon them. The state shall watch over them in the performance of this duty. (...) Article 7 (1) The entire school system shall be under the supervision of the state. (2) Parents and guardians shall have the right to decide whether children shall receive religious instruction. (3) Religious instruction shall form part of the regular curriculum in state schools, with the exception of non-denominational schools. Without prejudice to the state’s right of supervision, religious instruction shall be given in accordance with the tenets of the religious community concerned. Teachers may not be obliged against their will to give religious instruction. (4) The right to establish private schools shall be guaranteed. Private schools that serve as alternatives to state schools shall require the approval of the state and shall be subject to the laws of the Länder. Such approval shall be given when private schools are not inferior to the state schools in terms of their educational aims, their facilities, or the professional training of their teaching staff, and when segregation of pupils according to the means of their parents will not be encouraged thereby. Approval shall be withheld if the economic and legal position of the teaching staff is not adequately assured. (5) A private elementary school shall be approved only if the educational authority finds that it serves a special pedagogical interest or if, on the application of parents or guardians, it is to be established as a denominational or interdenominational school or as a school based on a particular philosophy and no state elementary school of that type exists in the municipality. (6) Preparatory schools shall remain abolished.