Atheist family here too. We haven't run into any issues yet, but we live in a very secular area. Even religious people here rarely talk about religion unless they are talking with other religious people. Religion just doesn't come up. I feel very fortunate that we don't have to worry about that kind of thing.
Happy atheist, vegan, punk rock-loving scientist. Wife to the love of my life Matthew (SAHD), mom to DD "E" (4), baby boy "K" (2). Proud stepmom to DSS "M" (26)