I have a question that requires answers from multiple religions. Where do I ask it? There should be a place for inter-religious dialogue. BTW I have read this: Why not have religion.stackexchange.com instead of Christianity/Judaism/Biblical Hermeneutics?
You can't ask a question about all religions in one place, and the answers in the question you linked explain why such a site isn't practical. You can, however, tailor your question for each community whose input you want, and ask it there. (Don't just cross-post the same question; that tends to produce poor quality and is discouraged.)
On each site ask your question from the perspective of that religion. You'll then have to synthesize the results, same as for any project that requires answers from multiple communities (or multiple questions in the same community).
If a question has several "right" answers, it's probably not a good fit to the Stack Exchange model generally.
If, however, what you're after is a philosophical insight into, say, the similarities and/or differences between particular religions on a particular issue, then Philosophy might be the place.