Donald Trump has stated publicly that he considers Marble Collegiate to be his church.
It is no ordinary one. Marble Collegiate is one of the oldest continuous Protestant congregations in North America. During Trump’s formative years it was led by the Reverend Norman Vincent Peale. Under his leadership, Marble Collegiate acquired a huge congregation numbering in the thousands. Most of those attending, in conventional Fifties’ fashion, went once a week - mostly to hear Peale’s sermon - but were not otherwise much involved in religious activities. Thus, Marble Collegiate was huge, but not a megachurch in the modern sense, which tends to provide lots of other kinds of programming in which many members participate.
Peale’s message was a fairly simple one: Think positive thoughts (which can drive out negative ones), be optimistic, and concentrate on personal fulfillment. Peale elaborated on those ideas in many books, the most successful of which was called The Power of Positive Thinking.