Read a Systematic Theology
An important skill for any apologist is to have a good general knowledge of theology. You cannot detect counterfeits unless you can recognize the real thing. It is unfortunate that many Christian never get a good overview of theology.
When I first became a Christian, I spent a year in an adult Sunday school class that went through Christian theology. Although this was aimed at new believers, more mature believers need to immerse themselves in theology as well.
If the only theology is what you get from your pastor on Sunday mornings, it is not near enough. Although apologetics books deal with theology, it is better to study theology directly.
If you live near a Bible college or seminary, it would be beneficial to take a theology class even for audit. It would also be a good idea to read some good theology books, preferably from a number of perspectives.
My challenge to you is to read through a book on systematic theology. Do not feel the need to rush through it. Read through small sections and reflect on what is being taught. Such an experience will be very helpful to your apologetics ministry.
Find other posts in this series here.