www.lds.org; “For a testimony of the restored gospel to be complete, it must include a testimony of Joseph Smith’s divine mission. The truthfulness of The Church of Jesus Christ of Latter-day Saints rests on the truthfulness of the First Vision and the other revelations the Lord gave to the Prophet Joseph. President John Taylor, the third President of the Church, wrote, “Joseph Smith, the Prophet and Seer of the Lord, has done more, save Jesus only, for the salvation of men in this world, than any other man that ever lived in it” (D&C 135:3).”
Matthew 6:24; “No man can serve two masters: for either he will hate the one, and love the other; or else he will hold to the one, and despise the other. Ye cannot serve God and mammon.”
If anyone has a testimony supporting this “restored gospel” that person cannot possibly have a testimony that Jesus is Lord.