That's not a contradiction; change in therapy is about the change that's right for you, somebody imposing their religious beliefs on you is about change you don't want or need. Very different.
I am an atheist and my T was brought up Catholic (I only know this because I read his book) but he literally never mentions religion and I have no idea whether or not he still believes in god(s). But I do live in a very secular country, and I imagine a Christian counsellor would be the exception over here. I doubt anyone would advertise themselves as one unless they were employed by the church.
Did you see the Secular Therapist Project? Here's their fb page since the homepage seems to have a security certificate issue https://m.facebook.com/The-Secular-T...0026059392270/