Taking direction from St. Paul, it is common to claim that Christ (crucified and risen) is the head of the church, his body--a very organic, biological metaphor.
Some theologians assert that as the body of Christ, the church is the presence of God on earth. Considering that the church is most definitely a slow-moving, often curmudgeonly, and frequently sinful and fractious entity, claiming it is the presence of God (or the risen Christ) can seem daring, if not blasphemous.
I think of the statement the New Testament character Nathanael (John 1) made when excited friends had announced to him that they had found the Messiah (the Christ), "Can anything good come out of Nazareth?!"
Often those in the first bloom of their welcome into the Church are thrilled. Later, disillusionment may set in, as the sorry reality of congregational life seems anything but the presence of God.
But the Apostle Paul, dealing with his troubled congregations kept seeing them as, and naming them as, the body of Christ. Most remarkable.
What if we look at things this way: the head is the seat of consciousness, of will, or intention, of setting direction. True, the head, that is the brain, is most definitely also body, but body with a special function, and a wise head will pay attention to body language.
The body (the church) in all its various parts and expressions will do well do recall, as best each part can, that the head is greater consciousness, knows more of what the realities are, knows what the overall plan is, and directs the body--not the other way around.
Mini versions of this metaphorical example can be pondered: parents and children share a common flesh and family structure, but parents always (one hopes) know more about the overall scope of the world and helpful and necessary responses to it. Another example: anyone who's ever held a key leadership position in an organization, especially a large organization is in some sense the "head" of the organization, and knows more about (has a greater conscious awareness of) the issues, policies, and politics inherent in that organization--and may be privy to some aspects of the organizational life that much be carrried quietly and not shared with everyone).
So with Christ as the head of the church. Our faith is not in our believing, but in the faithfulness, wisdom, and purposes of Christ, whose vision and consciousness of the whole picture (even the cosmos) so far exceeds ours that humility is our only wise option. Wise also to live trusting that the head, the Christ, pays constant attention to the pains, moods, dysfunctions, illnesses, efforts, sorrows and joys of the body, and leads it forward in helpful, healthful ways, even when it sometimes is a painful thing.
Nazareth is the incarnation of the Christ into real humanity in real time and in full reality, just as it is, with a future yet unseen.
