Prince Charles With Czech Orthodox priest Jaroslav Šuvarský in 2010

Prince Charles was confirmed at age 16 by Archbishop of Canterbury Michael Ramsey at Easter 1965, in St George's Chapel, Windsor Castle. He attends services at various Anglican churches close to Highgrove, and attends the Church of Scotland's Crathie Kirk with the rest of the royal family when staying at Balmoral Castle. In 2000, he was appointed as Lord High Commissioner to the General Assembly of the Church of Scotland. Charles has visited (amid some secrecy) Orthodox monasteries several times on Mount Athos as well as in Romania. Charles is also patron of the Oxford Centre for Islamic Studies at the University of Oxford, and in the 2000s, he inaugurated the Markfield Institute of Higher Education, which is dedicated to Islamic studies in a plural multicultural context.

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Sir Laurens van der Post became a friend of Charles in 1977; he was dubbed his "spiritual guru" and was godfather to Charles's son, Prince William. From van der Post, Prince Charles developed a focus on philosophy and interest in other religions.

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Charles visited Eastern Church leaders in Jerusalem in January 2020 culminating in an ecumenical service in the Church of the Nativity in Bethlehem, after which he walked through that city accompanied by Christian and Muslim dignitaries.

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Although it had been rumoured that Charles would vow to be "Defender of the Faiths" or "Defender of Faith" as king, he stated in 2015 that he would retain the monarch's traditional title of "Defender of the Faith", whilst "ensuring that other people's faiths can also be practised", which he sees as a duty of the Church of England.

Source: wikipedia.com