what is the name of that nominally christian group who...

[beeinmygarden]

They only seem to have one firm belief, that jesus is not the son of god, they still meet on sundays at 11am, service structured like a church service, singing and a sermon, but basically you can come along and believe anything or nothing and it doesn't really matter. it's driving me mad! I went to a few of their services years back.

I think Jews for Jesus can be quite offensive to some Jewish people - it was a jewish comedian in a synagogue who I heard refer to 'J4J or as I call them, Christians.' He got a big laugh. He looked genuinely exasperated at J4J.
I speculate that there is a suspicion that there mission is to convert Jews ( I may be wrong about that).

Didn't they cause a rumpus quite a while ago for printing a cartoon of Jesus carrying his cross on his back into Auschwitz? Was that them?

their mission, (not there mission!)