Also Article 30:
"In those States in which ethnic, religious or linguistic minorities or persons of indigenous origin exist, a child belonging to such a minority or who is indigenous shall not be denied the right, in community with other members of his or her group, to enjoy his or her own culture, to profess and practise his or her own religion, or to use his or her own language."
Of course, like most rights the right to freedom of thought, conscience and religion does not stand alone. It is often linked with the right to freedom of opinion and expression and also the right to peaceful assembly and association. Here is a useful visual: