In the Friday night Bible study, we are focusing on "systematic theology." For many Christians, the words "doctrine" and "theology" have a dull, lifeless feel to them. But theology is knowing about God, and you can't know God without knowing about him. So theology is a vital part of having a real relationship with God.
For example, one important biblical doctrine is that God loves sinners (e.g., ). No one can ever really know God without knowing and understanding this doctrine! Anyone who knows God at all knows some things about him. Those things are "doctrines," and if you put all the doctrines together you get a "theology."
So all Christians are theologians! If you learn about God, think about him, or know him at all, you are a theologian with a theology. For Christians to learn, think, and talk about theology systematically just means being careful instead of careless about knowing God. Surely that's a good thing!
A "doctrine" is just a summary of all the Bible says about a topic, such as love or the Holy Spirit or whatever. "Systematic theology" is just thinking about how important various doctrines are, and how they relate to each other in the Bible. So good, careful theology means being faithful to the Bible. Surely that's also a good thing!
Theology and doctrine aren't dull and lifeless. Instead, for Bible-believing Christians, they are vital and invaluable. The very word "theology" comes from the word for "God" and the word for "study of." What Christian wouldn't find studying God interesting?