Fundamental Rights
(1) No religious instruction shall be provided in any educational institution wholly maintained out of State funds. (2) Clause (1) does not apply to an institution administered by the State but established under an endowment or trust requiring religious instruction. (3) No person attending a State-recognised or State-aided educational institution shall be required to take part in any religious instruction or worship conducted there, unless that person (or their guardian, if a minor) has consented.
Fully government-funded schools cannot teach religion as part of the curriculum. An exception exists for schools that were set up by a trust requiring religious instruction even though the government now administers them. And no student at any state-recognised or state-aided institution can be forced to attend religious instruction or worship without their (or their guardian's) consent.
A fully government-run school cannot make religious prayers or scripture classes compulsory for all students - but a government-aided school originally founded by a religious trust, which has always taught its founding religion, can continue to do so as long as no student is compelled to attend without consent.