I have no problem at all anyone who lives the faith story that makes sense to them. If someone is about caring for people, especially the marginalized and the "other", I don't give a rip if they're a "born-again" Christian, a Roman Catholic, a Jew, a Sikh, a Wiccan, ... The faith story makes it clear what should matters and what should not.
No version of the Christian Bible with which I am familiar goes into exposition about how a public coffee company with employees of many (or no) religions should design their cups for the month-long bacchanalia that is "the Christmas holiday season". I don't see Eastern Orthodox Christians bashing Southern Baptists for celebrating Easter on "the wrong day".
IMHO, for people with mature faiths, bearing witness to their god does not depend on whether the women in their congregation wear pants or sit at the back or whether the refugee they're supporting agrees with saying "Hail Marys" for penance. Nothing wrong with following those rules for oneself. But it's a variation on the main theme. And when people try to make their rules everyone's rules, I'm absolutely out of it. If your religion can't stand hearing "Season's greetings" instead of "Merry Christmas", maybe it's time to re-prioritize and keep the main thing, the main thing.