In general, there is a sloppiness about Christology today. I don’t think that any particular heresy is being intentionally advanced in the church—it is just a general sloppiness about thinking through who Christ is.
The tools we have at our disposal are the Nicene Creed and the Chalcedonian Creed. We use those documents as gateways back into the biblical text. The Bible is rich in its teaching of who Jesus is in His humanity and deity and the unity (what we call the “hypostatic union”) of those two natures in one person. It is a very simple formula: Jesus is truly man; He is truly God; He has two natures in one person. We have to keep pushing that formulation and not allow any of those three propositions to get relaxed because the moment we do, we let in heresy. We need to shore up that theological proposition of who Jesus is because it is the gospel.
This is not a marginal issue, nor is it incidental to our mission to preach the gospel. The gospel is the work of Jesus, and behind the work of Jesus is the person of Jesus. So, we cannot afford to be sloppy in our Christology.