I'm an atheist so religion is completely foreign to me and to be honest, the very rare times I encounter religious people, I just think "how odd". Religion is simply not a part of most people's lives in my country (except for Muslims I suppose). I have no idea what my therapist believes in but I suppose she's probably indifferent to religion which is the most common attitude where I live. I think it's fine if you want to talk about religion with your therapist and I don't think it matters what she thinks/believes. From your description she seems like she can handle anything.