I'm sorry Austin, but you are incorrect on this one.
If you scroll down a bit, you'll see as a minimum requirement for application:
"An academic major in Mathematics, Applied Mathematics or the equivalent (see below) with a minimum of 36 credits in Mathematics." *
"*These 36 credits must include courses in single and multivariable calculus, linear algebra, and at least two of the following four more advanced subjects: abstract and/or applied algebra; analysis or advanced calculus; geometry, including non-Euclidean geometry; probability and/or statistics. You must also have taken at least one mathematics course that significantly uses computers and/or graphing calculators."
I think a teacher who did well in these courses would be prepared to teach math in high school, but in the beginning of this thread I noted that the average math SAT of math teachers was 590. I think a math SAT of 700 is needed to handle these courses, unless they are quite watered down. Probably most math teachers do not have the background you have described?