I believe that we just borrow our lives from God. And He is the only one who have right to take them away from us.
It's not all about God, religion or beliefs. It's about punishing criminals with a death penalty. No matter what what kind of religion you are into, a crime is a crime. Death penalty shall be given to those should have received it.
But death penalty is the only solution to solve all the crimes that the world facing right now. Death penalty is a law that aims to kill people who commits massive crime. Death penal should be use in a right way and it should not punish to innocent people because all life in this world is important.