Hi MommyOf2;
Nobody can predict the future. These people who are predicting a 'doomsday' in 2012 use wild claims to scare people into thinking that their ideas are true. They throw everything into the '2012 pot'. Every crackpot 'alien invasion', or 'scientists gone mad' scenario, every ancient culture that ever existed, and some that didn't (like Atlantis), every comet, planet, star or asteroid ever mentioned… they all go into this 'theory' (which is a gross misuse of the word, by the way).
I can't tell you what will happen in 2012. I can tell you that the claims that these people make are just wrong. That's why this site uses the approach of tackling the claims one by one. We try to take each individual claim and show why it is incorrect, like how Nancy Lieder ignores the well known effects of gravity when she makes her claims about Planet X.