Answer the questions then, why did Jesus have to die if you Catholics can save yourselves through the sacraments.
We can't "save ourselves" through the sacraments. This is an ill-constructed question.
Sacraments are how salvation, saving grace that is, is communicated, transmitted to us. Your question is like saying "why do you have switches and wiring, I thought you believed in electricity?"
When you bathe the baby, is it possible because God created water and makes it rain, or because there are pipes and faucets in your house?
SD