1 Corinthians 8:6---King James Version (KJV)
6 But to us there is but one God, the Father, of whom are all things, and we in him; and one Lord Jesus Christ, by whom are all things, and we by him.

1 Timothy 2:5--King James Version (KJV)
5 For there is one God, and one mediator between God and men, the man Christ Jesus;

Ephesians 4:4-6--King James Version (KJV)
4 There is one body, and one Spirit, even as ye are called in one hope of your calling;
5 One Lord, one faith, one baptism,
6 One God and Father of all, who is above all, and through all, and in you all.

1 Peter 1:3--King James Version (KJV)
3 Blessed be the God and Father of our Lord Jesus Christ, which according to his abundant mercy hath begotten us again unto a lively hope by the resurrection of Jesus Christ from the dead,

John 17:3---King James Version (KJV)
3 And this is life eternal, that they might know thee the only true God, and Jesus Christ, whom thou hast sent.

How do the faith alone fit the NT theology into Trinitarian theology?

The LDS believe in the trinity(God the Father, God the Son, and God the Holy Ghost)--but not in Trinitarian theology. And if the above NT scriptures are true--then neither did the NT writers.

Also--how do the Trinitarians fit the OT theology--with the NT theology?