God gives us the gift of life. We are not supposed to squander it or to end it ourselves without good reason, such as saving other lives. God does the deciding about when it’s your time to go.
If true, then why would a loving god let some one suffer in agonizing pain. God also gave us the gift of free will. Unlike animals, we have the ability to think things through and for us to do what is best for us or our family. So, if God decides when we die, he wouldn’t allow us die of our own free will would he. I also don’t think he would want us to suffer needlessly. Do you honestly think he decides who lives and dies in a time of war, severe illness or in an accident? If you believe he does, he would have never allowed us to invent modern medicine that saves lives daily. Are we going against god will when we cure a patient of a terminal disease?