Trying to Know the Unknowable

What does it mean that we have so much to say about God, who is really unknowable?  Why do we try so hard to say what can only be an approximation of what might be true, and then only for now, about someone who is so very unlike what we would like to conclude?  I suppose we do it because there is a need to reach beyond where we could be were we only to be reasonable.  We need to because the question of who God is, what he may be like, and of who we might be to each other is more important than other questions more easily answered.