Exposing Adventism - Was an Adventist

Ellen White assures us that Enoch was an Adventist (with a capital "A".)

Enoch was an Adventist. He directed the minds of men forward to the great day of God, when Christ will come the second time, to judge every man's work. Jude tells us, "And Enoch also, the seventh from Adam, prophesied of these, saying, Behold, the Lord cometh with ten thousands of His saints, to execute judgment upon all, and to convince all that are ungodly among them of all their ungodly deeds which they have ungodly committed, and of all their hard speeches which ungodly sinners have spoken against Him. These are murmurers, complainers, walking after their own lusts; and their mouth speaketh great swelling words, having men's persons in admiration because of advantage." [Jude 1:14-16] (The Signs of the Times, October 12, 1904)

Was John the Baptist an Adventist too?