Beginning in 1784 Freeman preached a series of sermons on the unity of God, stating his dissatisfaction with certain parts of the liturgy, and giving his reasons for rejecting the Trinity. He thought that these would be the last sermons he would ever give there. To his surprise, he was heard patiently, attentively, and kindly. He persuaded the Church to alter the liturgy, eliminating all references to the Trinity and addressing all prayers to God the Father. The Chapel was the first church in America to make such changes. On that ground, it might be considered the first Unitarian church in the country.