Biblical Theology 

Everybody has a theology.  The atheist has a theology, the Muslim has a theology, the homeless drug addict has a theology . . . they may not all be aware of it but they all have one.  And our theology affects every part of our life.
 
Put simply, a theology is what you believe about God.  As a consequence of what people believe about God (their theology), they form a view on what they think about what God thinks. 
 
If you have a view of what’s right or wrong, you have a theology.  If you have a view of life after death or why bad things happen to nice people you have a theology.  If you have a view of marriage, relationships with your parents or children, about abortion, divorce or homosexuality . . . whether you know it or not, you have a theology.
 
What atheists, Muslims and most of our society do not have are biblical, systematic theologies.
 
Therefore, we Christians are surrounded by a plethora of theologies 6 days a week and, unless we take steps to develop a biblical theology, we are in danger of aligning with the views of the world that often are opposed to God’s will for us.
 
A systematic biblical theology is the best way to counter this.  It sounds scary but all it means is to find out what the Bible has to say on a topic.
 
Every Sunday you are exposed to expository biblical study in the sermon.  This is where a text is explained and applied to our lives.  This is the best way for pulpit preaching, but it is not systematic.  A sermon will start with one text and explain it.  In contrast, a systematic study starts with a topic and looks all over the Bible for the teachings on that topic.