Xtree,

I know the feelings of not being able to resist, it is hard not to want more than what we have in a good T relationship. I thought I wanted more, but I learned the hard way. He infiltrated himself into my life. My first 5K, became "our first 5K" my playing the trumpet again became what "what he did for me in order for me to play again". My workout place became "our workout place". It just goes on and on and then eventually he became me. He involved himself into everything I did. Now after I fired him, I had to move on without him, and everything I did within those 2 1/2 of therapy with him feels like a loss. It is like I lost myself. Plus the almost 2 years of depression I went through when I had to fire him. Keeping his life separate from mine was HIS responsibility, just like it is your T's responsibility. There are boundary rules for T's for a reason, it is to protect the both of you. Some T's don't see the seriousness of those rules, and that can become very dangerous.

Your T asking you to join her church and then being in the same study groups is really going past the line of ethical boundaries.

Church is a very personal thing for people, and if anything went wrong, you would be losing a lot. Things would feel very awkward for the both of you. It just isn't worth it. Having a good T is worth so much more than anything you can gain from a personal relationship with them. Personal relationships can get messy and you lose that therapeutic perfection.
Most T's won't even do marriage therapy when they have an individual client first. It blurs the line of who she is suppose to be helping. This whole thing just feels so wrong. I am glad you are at least asking, just you asking shows me you are having some doubts. Go with your gut feeling.