Encyclopedia of Mormonism, pg. 271; “Traditional Christianity often defines Christian affiliation as the acceptance of certain beliefs and dogmas. Because Latter-day Saints do not accept certain extrascriptural dogmas-especially those bearing the philosophical overlay of much post-New Testament Christian teaching-some in other churches feel that Latter-day Saints cannot be Christian. They are not “orthodox” in this sense. But for the Mormon, right beliefs (orthodoxy) and right behaviors (orthopraxy) are those congruent with the revealed mind and will of the Lord. Some of the misunderstandings between traditional communities and the Latter-day Saints arise from this issue: whether Christians must first believe traditional, especially credal, dogmas in order to live “correct Christian lives.””
Philippians 1:6; “Being confident of this very thing, that he which hath begun a good work in you will perform it until the day of Jesus Christ.”
No, Christians believe in what the Bible says. The writings by the church fathers in the early years serve as a statement of what is in the Bible, not the other way around.