To which Christian denomination did Michael Faraday belong?

Michael Faraday belonged to the Sandemanian denomination.

The Sandemanians were a small Christian community descended from the Glasite movement, which began in Scotland in the eighteenth century. The group emphasized strict biblical practice, independent congregations, and a disciplined communal religious life. In England, the movement became associated with Robert Sandeman, whose name gave the denomination its more familiar designation.

Faraday was introduced to the faith through his family. His father was a member, and Faraday attended the Sandemanian meeting house from childhood. He formally joined the congregation after his marriage to Sarah Barnard in 1821. He later served as a deacon and as an elder, taking on responsibilities that included helping lead worship.

The answer is sometimes confused with Anglican or Church of Scotland because of the Sandemanians' Scottish origins. However, Faraday was not simply an Anglican or ordinary Presbyterian; Sandemanian is the specific denomination associated with his adult religious life.