I’m the only one in my immediate family who is an atheist. I may have a few uncles and a cousin that are agnostic. The rest are pretty much churchgoers, mostly Catholic with some mega-churchgoers thrown in. Fortunately, it’s never been an issue. I don’t get harassed for it which is a good thing. And I don’t harass them for going to church. I never argued with my elders about religion, mostly because they were too old and best to leave them be, but if nephews or nieces ever ask me about my religious views or lack their of I’ll tell them. And if my siblings don’t like it. Tough.