The Bible has a lot to say about the soul of mankind and how we think. I am against a secular psychology like I am against a liberal theology, but I am certainly for a biblical psychology or any Christian psychologist who loves the Lord and desires to help others. Christ Centered Therapy is a book on integration which understands that the Word of God is the only authority for faith and practice. We believe that general revelation needs to be understood through the grid of special revelation which is the Bible. Research is helpful when it is descriptive, but potentially harmful when it becomes prescriptive.
Truth is truth whether it is learned empirically or by divine revelation.
Some of what my co-authors, Drs. Terry and Julie Zuehlke, learned in their secular education had to be thrown out of course, but much of what they learned was only confirmed as they came to Christ and grew spiritually. Terry and Julie had a new way of explaining reality when they became Christians. Secular psychology is all over the map, because secular theorists have no authoritative basis from which to work and no absolute truth by which to compare. Trying to explain reality without the Creator's perspective leads to foolish speculation.