The maths and physics contained within ATPL is nowhere near enough to be a maths or physics teacher. ATPL does not have any differential or integral calculus, stats and probability, number theory, euclidean geometry, nuclear physics, quantum mechanics, thermodynamics, electromagnetism (not the same as electrics).
You would have to demonstrate that you are comfortable with all aspects of maths and the best way of that is to have a degree in the subject.
Cheers
Whirls