I think one place it's easy to get confused with spiritual support is that it's about the person posting, asking for support, not about the person responding. So, any "I believe x, y, or z" is instantly off-topic in a sense because it's not about supporting the person who posted.

I was a little confused researching spiritual support pages because they all say "we will bring in a minister of your faith. . ." so "naturally" move into one's religion. I didn't see how it would be possible to separate spiritual and religion but now I see that it's a response to the original person and their needs, not a, well-here's-what-I-believe, why don't you use that, reaction. If one's beliefs are different or one doesn't know what one believes, it's the searching that is supported, the "desire," not the belief system itself. Bringing religion into it would be like my wanting to bring my treatment for anxiety into someone else's depression discussion. The anxiety and depression are not what are important, it's the struggle with mental illness issues and the joint, human familiarity with that that matters.