JM2C
CHRISTIAN
From the O.T., Deuteronomy 6:4 "Hear, O Israel: Jehovah our God is one Jehovah" -ASV or English translation, but in the original Hebrew its very clear that trinity existed long before the N.T.; "Jehovah our Elohim is one Jehovah" the word Elohim being plural shows that God the Lord, is more than one, yet is "ONE Jehovah". Did Moses see the trinity already back then in the O.T.? Yes!There is nothing in Mormon doctrine which, when properly understood, is inconsistent with the Bible, and the LDS understanding of God is probably more biblical than traditional Christianity's.
For instance, there is nowhere in the Bible where God is described as a three-in-one essence which fills the universe. A further discussion on this topic, however, would take us off the topic of the OP. That's something I don't like to do.