How long have you been seeing the T? Do you have much of a rapport? Aside from this revelation, are you okay with how things have been going?

I see you're in the UK. Do you have the option to see a different T? I know the NHS can be restrictive.

Gotta say I'm with you on this - I would have a lot of difficulty seeing a T who believed in homeopathy, crystals, or various other things. It's worth bringing up with the T, if you are otherwise liking your work/relationship with them... but if you have other options, it's not unreasonable to draw a line.