i know we are going off-topic here but i have to respond to this. a theory, is a set of explanations to explain a set of facts. a theory can be false, as it can be true. and we seek to prove / disprove theories using evidence. that is the key.
sure, the Big Bang theory is a theory. but it is backed up by evidence that can be demonstrably proven. for example, the mathematics. the astrophysical evidence. etc etc. these are demonstrably reviewed and debated at academic forums. there are still many things we don't know, and that is fine. that is why we do better science to answer those questions.
intelligence design too is a theory. but the problem with it is that the claims are demonstrably wrong. the evidence supplied are simply not good enough. i can't do as good an explanation as my colleague kenneth miller can, so i implore you to watch this.
http://www.youtube.com/watch?v=d4r2J6Y5AqE
the most important thing here is that being objective does not mean giving equal treatment to both sides. no. being objective means stating the facts as they are, and weighing evidence before deciding what the sum total of the evidence points towards.