Speaking strictly for myself, I’ll believe anything you tell me as long as you can support it with the appropriate evidence. If you tell me there’s life after death, I’ll believe you – after you show me how you know it’s actually true. I do not accept arguments from authority, arguments from faith, or any other example of motivated reasoning. You need concrete, repeatable evidence before I take you seriously.

Not all atheists are skeptics, and not all skeptics are atheists. But they are very complementary positions.