Um, I'm pretty sure this is standard doctrine of most Christian Churches, that Jesus Christ is Jehovah of the Old Testament. He is God, and according to the trinity doctrine, isn't this what you believe as well?
Absolutely. I believe the Bible (and even the Book of Mormon) when it says THERE IS ONE GOD. So, if Jehovah is God and the Father is God, then they must make up 2 part of the Trinity - ONE GOD. When you introduce Mormon theology which states that God and Jesus are 2 different gods is when the confusion starts.