I am a Christian, so this is interesting for me... So of course I don't believe when someone dies they are just gone..

But I understand where you are coming from and I understand your frustration. In the end, it's within your power to tell that T that she is out of line with you. T's should not be missionaries. (Although I know some missionaries who are T's :-) Especially if the client expresses their beliefs and asks not to have religion or faith mixed into T.

Panda is right, it would have been easier and probably much more helpful to just slightly word the question a little differently.

Just a side note... my therapist is a Christian too. She doesn't advertise it or brings it up by herself EVER. But when I told her I was a Christian, she had this huge smile on her face and said: So, it wouldn't be really weird for you if I would tell you that I pray for you a lot? Gosh, I loved her for that! But she would have never discussed her faith with me if I hadn't brought it up. I think that is the right way to go about it.