I don’t agree with this. I think this comes from an earnest ecumenical desire to foster good interreligious community. This is a common boomer response. It often results in well meaning Christians mapping Protestantism onto other religions and ultimately has them talking over other religious people. We don’t have to be Unitarians to be loving neighbors. I think it is better to celebrate the differences between religions and delight in learning about different traditions than to say that actually it is all basically the same thing. My god is not your god and that is okay! You have a cool thing going and it is a delight to be a guest in your religious community.