The fact that I am a pagan is the big one. My religion is growing but is not at all mainstream. Many people still have a great deal of misconceptions about it, so I don't always mention it. My MOPS group is of course, Christian based, Baptist in fact, though they are very good about making everyone feel welcome even if you are Catholic or (as they think of me) you don't attend church. I've never stood up and told them I was a witch. I don't know all of them well. Some people I think would have no problem. I know one woman's husband is a Wiccan. But there are people in the group that are already offended by Santa & jack o lanterns being on decorations. I can only imagine their reaction to an initiated witch in their midst, so I tend to keep quiet to avoid conflict. There are not many pagan digi scrappers either, though I do know several.
Among the wider pagan world, the fact that I am so 'mainstream' sets me apart. I hang out with the Christian moms, I digi scrap. I am not a radical lesbian vegan liberal who chains herself to trees on the weekends while wearing all black and a hal a dozen giant pentacles. :) Of course among my RL coven I am considered quite normal - but then we are a coven of 40ish, mostly ex-military, rural, conservative, almost Republican witches. If we were Christians we'd fit right in with our Baptist neighbors. :)