No we can't, though religious people in their prayers, hymns and proclamations (and in what they tell their cildren in school) give a very good impression of being absolutely certain. The whole question of testing atheists is bogus. It isn't atheists who need to be tested. We are not non-believers. We are the creation of believers. Once believers start believing things they must have another category for those who don't subscribe to their ludicrous ideas. We were here all the time and we didn't need a name. I hate "atheist" but go along with it because it's hard to have the debate unless we have a label. It stinks because it defines a whole body of people on the spurious grounds of religion. Atheist is bad enough. Non-believer is even worse. But we're too nice to believers to do it the other way round: give them all the negative names instead of us. Any ideas?