My assumptions are in regards to professional therapists, I have come across others who have seen marriage "counselors" who were actually religiously affiliated or self titled helpers.
Sample of one.
Therapy is not going to "fix" the marriage...as is often stated, MLC is NOT a marriage issue. However, a therapist should take into consideration the pain that the LBSer is experiencing if he/she is seeing both of you.
The best "counseling" for my well being was from our parish priest ( as well as other priests along the way)who insisted on seeing Mr. xyzcf individually. Mr. xyzcf, prior to his crisis was a cradle Catholic, alter server for more than a decade and we attended mass every week together. For 35 years, our faith, values and beliefs were the same, until his crisis.
I felt comfort both in the times I spent with various priests and other's along the way and because he spoke to my husband directly... that was important in my own healing...because I understood then, that something was terribly wrong. Our parish priest also INSISTED that I protect myself financially which I did not want to do at the time because I thought it would hurt the chance of our reconciliation...he strongly encouraged me to take legal steps to protect myself.
My second and third counselors actually are both Christian professional therapists. I did not choose them because of their faith, but it sure was good for me to have therapists who understood my faith and beliefs.
As for "self titled helpers" I found a great deal of help from Rejoice Ministries daily devotionals.
Not everyone on HS has the same beliefs and values, especially about the permanency of marriage. What you can do is find a therapist that fits your world view...if you are not feeling at ease, do not hesitate to find someone else...professional or not.