Is Jesus God? I would like to answer this baldly stated question in the manner of that great preacher, Reverend Lovejoy: "No with an if; Yes with a but."
The answer to this question must be "no" if we mean that God, simply stated, is the human being named Jesus. Jesus is not God if we understand the identity of God to be exhausted in the history of the human Jesus. Jesus is not God if we mean God has no choice but to become a human being in order to fix his out of control creation. Jesus is not God if we claim to worship and serve a human being as such. Jesus is not God if it is implied that God had become incarnate in order to become that which he is not already in eternity. Jesus is not God if we understand God to already be a creature named Jesus before there even was a created order.
Nevertheless, the answer to the question "Is Jesus God?" must also be "yes." Yes Jesus is God, but as the incarnation of the eternally begotten Son of God. Yes Jesus is God, but on the basis of the fact that there already is in God's eternity a fellowship of persons. Yes Jesus is God, but only if we remember that God becomes human as an outpouring of his divine life as Father and Son in the Holy Spirit. Yes Jesus is God, but as the unfolding of a plan set in eternity by the triune God. Yes Jesus is God, but Jesus can pray to the Father without suffering from multiple personality disorder since the Son has been praying to the Father throughout eternity. Yes Jesus is God, because the Trinity logically precedes and therefore grounds the Incarnation.
In other words, the Trinity is the divine line of credit upon which the Incarnation draws. The Triune life of God in eternity is the condition for the actuality of temporal incarnation of God in the man Jesus. This is why, historically speaking, the doctrine of the Trinity had to be established first (4th century: Nicea & Constantinople), before the church turned its face fully to Christological problems (5th century: Ephesus and Chalcedon). This may seem counterintuitive, for as this post shows it is precisely the Christological question which leads one to the Trinitarian formula. Yet the order of discovery does not always correspond to the order of reality. Christology leads to Trinity, but only the Trinity has the resources to ground Christology. The key of course is that they remain inseparable. For the Trinity without Christology is meaningless metaphysical mathematics. But Christology without the Trinity is ungrounded pious assertion.
So what's my point? Certainly we can confess the divinity of Jesus without all this further ado. But it pays to remember the pains with which Christians have always treaded carefully around the topic of the divinity of Jesus. It's not something we just assert and say "love it or leave it." "Jesus is God" is a mystery worthy of manifold adoration -- an act of worship which includes precise theologizing in order to block misleading implications that leave us open to all sorts of attacks. So keep saying 'Jesus is God." Or keeping asking "Is Jesus God?" But whether you confess or ask, accept or reject, give a weighty statement like that the thought it deserves.
Is this account with its distinctions accurate?
Is it adequate?
Is it coherent?
Is it useful?