You don't need a teaching degree to effectively teach!
I'm not knocking certified teachers. I learned teaching while working as a substitute teacher and as a broadcast-media sales representative. As a mother, I had to learn to help with homework! I'm not a baby-boomer! We did things the hard way (before dishwashers!). And we were achievers!
Now I can pass those good habits on to my students! Whatever you do, do it with excellence!