nope, not a good idea. Plus, if you stop taking them your absorption will be less and you run the risk of other nutritional deficiencies.
I can't not take my enzymes or I pay the price - though, like you, I have tried experiementing with them to see how I might lose weight. It doesn't really work. I can say, keep up with the enzymes and try to just change your diet if you want to lose (fruits and veggies! yum!) and keep exercising!!