As I am finishing up my evangelical anthology, I have to decide if I should include Isaac Watts. I'm not sure that there is a certain answer on whether he was an evangelical. He certainly corresponded with leading evangelicals in America and Britain, but there are reports of him holding unorthodox views of the Trinity later in his life. In her entry in the Oxford Dictionary of National Biography, Isabel Rivers brushes off claims of his heterodoxy, arguing that he simply struggled to express his views of the Trinity clearly. Perhaps he is the "Bonhoeffer" of his day, with liberals and conservatives both wanting to claim him for their party.
Any thoughts on how one should categorize Watts?
Exploring the Study of Religious History