Jaroslav Pelikan, an important historical theologian who became Orthodox late in life, once told me, “You evangelicals talk too much about Jesus and don’t spend enough time thinking about the Holy Trinity.” Can one talk too much about Jesus?
I would not want to contrast faith in Jesus with faith in the Holy Trinity. My faith in Jesus is precisely that I believe him to be not only truly human, but also to be the eternal Son of God. I cannot think of a faith in Jesus that does not also involve faith in God the Father.
How is Jesus present to us personally at this moment? How is it that he is not merely a figure from the distant past, but that he also lives in my own life? That is through the Holy Spirit. Therefore, I cannot understand a faith in Jesus Christ that would not also involve faith in the Holy Spirit.
I don’t think we can have too much faith in Jesus. But faith in Jesus, if it is to be truly such, is necessarily Trinitarian. If you look at the lives of the Orthodox saints, you will find a very vivid faith in Jesus. Their affirmation of the Trinity did not in any way diminish their sense of Jesus as their personal Savior.