Some of us use to have a sort of certainty about what God is like
through His interaction with human being and His revelation
through the Bible. However, is it the real picture about God? It
is probably the picture that God want us to have (if we receive
it correctly). The point of the about story is that "throwing
objects" is not the real picture of human being but it is a
mean for the dog to understand and to develop relationship with
us. The whole point of revelation is to satisfy our intellect but
so that we can have a sense of who God is and in through what
means He want us to approach Him. In other words, the most
important thing is about our relationship with God. This acts as
a filter of our knowledge of God. For example, God revel Himself
as a God of love. Does it mean that it is His essential attribute
or is it something that He decided to "fit Himself in"?
If we start to ask question in this way, we are moving toward the
direction of academic enquiry and we completely lost the point (not
least, it will only result in speculation instead of knowledge).
God revel His love so that we can have confidence to approach Him
and to develop relation with Him (to know Him). Take another
example, God is omnipotent (this term is not even from the Bible
but we can find this idea from it). Does it mean God can create a
stone that He cannot move? The asking of this question mean that
we went astray again (even though by now, everyone know that the
answer to this question is cannot). God revel His omnipotence so
that we know that in whatever situation we are in, He is still
big enough to solve it (if He choose to do so).
We should never think that we have a complete and true knowledge
about God. Even if what we hold is true, it is only true in
reference to Human-God relationship. Therefore, those theological
differences that do not result in any significant difference in
Christian view or action toward God nor the world should not be
regard as real difference (e.g. the different understanding of
the Holy communion by Lurther and his contemporary Catholic
church as well as that of Calvin). That is what I meant by a
filter.
Another important application is that we should understand that
the certainty of our faith is a subjective one instead of
objective one. As Christians, we should be certain that what we
believe is the only right way to God but we shouldn't impose such
thought to other people. Of course, telling this fact to other
people is good and in some sense try to direct them is nothing
wrong but we should be very careful not to overdo it. I have seen
a lot of people (including me in the past) trying very hard to
show other people in the wrong so that what I claim may seem
superior. What we should do is to point them to Jesus and
initiate them to study the Bible (maybe with us). The decision is
their and we cannot help them to make it.
As stated above, I think it is the most important aim in different discipline of Theology. It can also be a dynamic type of Theology in which different people's experience of God and the way they react to God and thought about God are investigate. So as to make sense of these, to correct these if necessary and to formulate the right "theology" out of it. It has to be done in the church setting. No one can know about God-Human relationship by just thinking about it -- although they "can know about God"(!) with their logical mind alone.
This is an effort to express Christian believes in the terms that contemporary people will understand and find relevant. It is one of the theme of theology that attract the most attention throughout generations of Christianity. The most difficult is what the core message of Christianity is and how to express it, together with some other relevant ingredient of Christian faith, in a way that contemporary people will find more easy to accepted. Becasue it is a topic that is only relevant to and has interest for those who believe in Christianity, this should only be done in a Theologian Seminary instead of a secular University.
I think this part is more or less self-explanatory. There are two different aspects to this. One to look at the Bible as some other ancient literature and try to understand it as other books. The other is stress on the believe that it is the words of God and try to dug behind the surface meaning of the earthly writers / editors / revisers and to look at the coherent and objective messages that God want to bring to His people from "the whole Bible as a book". The first kind can be done in a secular environment and the second kind, I think, can be done only by believers. Of course, the first kind of study will affect the result of the second kind.
It is a subject to look at Christianity in a secular point of view just like other religions, e.g. what Christians believed or believing and the related matters arising. This sort of research can be done in a secular University. The results can then be picked up and refreshed upon by Christian thinkers in Seminary.
As you can probably see from my discussion above, there are three layers of "Theology" -- (i) the primitive and front-line layer (ii) the Christian thinkers layer (iii) the secular layer. Theology is thus a dialogue between Christian experiences, Biblical understanding and the secular world. The central theme of this dialogue is God-Human relationship.