Mr Pikachu: A scientific theory is different from the conventional meaning of "theory" in that it can't be a guess or speculation. Conjecture, yes, from the evidence given. While I don't disagree with you that theories aren't always correct, just look at Caloric Theory, but they must be proven or disproven scientifically through observation and reasoning, not through skepticism by religious nutcases who have no evidence to back up what they're saying.
LP: Such is the plight of philosophy; lots of argument that gets nowhere. For example, I could argue that the universe was created exactly one second ago by an all powerful being named Tony Montana and made the illusion that the universe was 13.7 billion years old, and, by Schrodinger's Uncertainty Principle, I can't prove it and you can't disprove it because we can't observe anything to support either argument.