Christians: Why do you interfere with the will of God?

Everytime you use a child seat, a fire extinguisher, call an ambulance, etc, are you not interfering with God's "plan"? It shouldn't matter what you do if God is going to do something, he's going to do it with or without the safety precautions we put in place. Wouldn't a more effective method be to pray when your spouse has a heart attack instead of calling the EMT's? Do you not trust in God to take care your baby more than a car seat? Why spend the money for these things when you can give it to the church instead and truly trust in the LORD? Or are you just hypocrites?