I tried to post to the other thread before it was closed:

thusly... Opinions are not the sort of thing that facts are relevant to.
Opinions should be about flavors, colors, beauty... and bands & songs...etc.
Facts are about things that can be measured & documented.

In the original thread, you said something about an opinion being 'valid', and I spent some time saying that validity is about the logical relation of premises to conclusions.
These distinctions are important because people constantly misuse words.... so religious beliefs are an opinion about some claims made by others. There are certain facts ABOUT flavors... and bands and the history OF religions.. but no facts that serve to prove any one is 'better'.