I can see how that is a struggle for you! When you attend religious events, have they talked about how it is wrong? (I'm not religious in any manner btw). Perhaps your T is trying to help you not feel so guilty over it because it is causing you a great deal of anguish. In your religion, can you ask for forgiveness? Can you speak to a religious leader about the struggle you are having? (I fully get that that may not be possible, but maybe it is and you are just not comfortable with that?). Is there perhaps a forum where you would be able to find others who are struggling with the same issue?

Perhaps you might want to try and talk to a T with a specialization in addictions about this issue for you. If you really wish to be totally abstinent, then I am sure that someone who works with addictions would be able to help you find ways to stop (and help you to forgive yourself). I do not think that you are addicted, and I personally do not find masturbation to be anything but natural, but if it is causing you such distress and you wish to stop, treating it like an addiction may help.

ETA: Thank you for being willing to share, I am sure that it was very hard to do!