Conservatives in Protestantism have NOT controlled the doctrine. This is true in the Episcopals, Methodism, United Church of Christ, Presbyterianism, Disciples of Christ, most Baptists, the larger branch of Lutherans, and many others. Invariably liberals control seminaries, publishing, and Sunday School curriculum. They seldom explicitly deny doctrine, such as the Trinity, they omit it, or redefine it so it doesn’t mean much. Children grow up with no awareness of the supernatural, or absolute truths at all.
Liberals don’t attack Jesus as savior, they redefine Jesus - or rather the “Jesus community” - as “saving” by being a role model for social concern. Protestants who for years fought for civil rights and the poor suddenly got labelled “conservatives” because they insist Jesus is God. Liberals are quietly starting to use the other gospels, soon anyone who insists only on the traditional 4 gospels will be labelled conservative, even if they have always been liberal.
The struggle in the TEC does not involve real conservatives - they’re gone. It is between the secularists, in control, and the moderates, who are not (yet) ready to buy the whole secularist agenda. The United Church of Christ now is what other Protestant churches will look like in the future.
Over a century ago Cardinal Newman saw this drift to secularism as the inevitable outcome for churches not guided by the magisterium.