Being bisexual or atheist?
Personally for me atheist as most of my friends already know.
I'm out on both counts. Telling my mom was hard both times, but telling new friends is pretty easy on both.
I'm pretty open about my atheism (especially now that our kid is no longer in a private school, and I'm no longer volunteering with his Scout group...didn't know that one is required to "express a belief in a higher power" when signing up). As long as I'm married, there's no plan to indulge in the same-sex side of my bisexuality, so it's really a non-issue. Except for my porn/browser history, there's no real "bi" activity to be outed.
People who know me, know that I am an atheist.
I'm out and loud about being an atheist. Atheist friends mostly know I'm bi (actually pan.)
Too bad this group isn't active. I've been an atheist all my life and very open about it. Bisexuality is different, I suppose because I have a preference for the ladies and many absolutely will not have anything to do with an actively bi guy. About the only people who know about that are attached to the dicks I've sucked. :-)
I'm a totally out atheist, and the point that my step-sister unfriended me on facebook. That's okay. I'm not out as bi, though, although I'm always on the hunt for sweet cummable cock.