The Five Solas of the Reformation were Sola Scriptura, Sola Gracia, Sola Fide, Solus Christus and Soli Deo Gloria. A Christian's theology must always be a Christ-centered one. How I learned about the Lord Jesus Christ was through the power of the Holy Scriptures and not through anything else. In the New Testament, the Lord Jesus preached from Scriptures. In the Book of Acts, Peter preached from Scripture. Paul preached from Scripture. All the apostles preached from Scripture. These were all Christ-centered theology. You will find them saying, "It is written." in references to Scriptures or quoting from the authors of the Old Testament to show what is fulfilled in the New Testament are all part of Scripture.
When theology is deviated from Christ, it deviates itself from the truth of the Word of God in the place of the anti-Scriptural traditions of men. Many people claim to preach a Christ-centered theology but it is centered on something or somebody else. The so-called last messengers of Christendom did not preach a Christ-centered theology but it was all around them and their doctrine rather than Christ and His doctrine. When the Scripture goes away from the truth about Christ then do expect a lot of nonsense not found in the Bible. Some teach that Jesus is still dependent on His earthly mother Mary or another teaches He was not God on Earth. These are just some examples of theology that deviates itself from the Lord Jesus Christ.
It is not only vain and confused but it is also mad, deceitful and spurious. If you have another Jesus than the Jesus of Scripture, you are not saved. If your Jesus is not Lord, you are not saved. If your Jesus is not the one spoken of in Scripture as the Son of God, the eternal Word, the Savior from sin then your Jesus is not the Jesus of the Bible but another Jesus. All these theology separated from the real Christ is a real road to Hellfire.