There is absolutely no reason why a Christian should avoid seeing a psychologist. Christians have needs like any other individual and these may, at times, include a need for psychological support or treatment. Whether the psychologist holds Christian views or not, is immaterial, for s/he will hold what are commonly considered Christian values: honesty, sympathy, a desire to help and promote the good of the other person. Otherwise, why become a psychologist?
There are psychologists who have little contact with the public because they are laboratory based and may not be dealing with people, but with ideas, tests, theories. A Christian, or other individual, would not be seeking help from such a psychologist but from one specially trained in psychological treatments including cognitive behaviour therapy and other talking therapies.