I used to say this. And I feel a little sheepish.
Check this out:
http://en.wikipedia.org/wiki/Plate_tectonics
^ Plate tectonics (from the Late Latintectonicus, from the Greek: τεκτονικ?ς "pertaining to building") (Little, Fowler & Coulson 1990) [1] is a scientific theory which describes the large scale motions of Earth's lithosphere. The theory builds on the older concepts of continental drift, developed during the first decades of the 20th century (one of the most famous advocates was Alfred Wegener), and was accepted by the majority of the Geoscientific community when the concepts of seafloor spreading were developed in the late 1950s and early 1960s.
I have heard a lot of people say things like:
"I don't believe in Evolution, it's just a theory."
The language in this statement can be switched with any other scientific "theory":
"I don't believe in Plate Tectonics, it's just a theory."
The first statement is fairly accepted among fundamentalist Christians. Yet the second one would get some laughs among all faiths.
Just food for thought.
-Sab