You cannot legislate in the name of God. We unfortunately do live in a world without recognition of God’s sovereignty. No one will accept “inalienable because of God” without then questioning all the evil and asking why God allows that to happen.
Unfortunately, in a fallen world, we do turn to authority to _guarantee_ our inherent rights. Perhaps the correct question is how did ‘guarantee’ become ‘grant’? We’ve come a long way from the Magna Carta, yet that was a case of people demanding that monarchs, who had the authority of God at that time, recognize the rights inherent to all humanity.
First of all, no one has said anything about legislating (making laws) in the name of God. Our government makes laws in the name of the United States of America. We would hope and pray that these legislators do this with God's guidance and following God's moral standards. America was founded on a belief in and trust in God as our sovereign. We recognized that our basic freedom and rights were given to us by God and no one including our elected government could take them away.
You said, "No one will accept “inalienable because of God, without questioning all the evil and asking why God allows that to happen.” WRONG. Only the Godless people question in that way. The Bible tells us that God did not create the world in the same state that it is now. God gives all of us the free will to choose between good or evil, and many choose to follow the ways of evil, we may also cause suffering to ourselves as the natural consequence of sinfulness and unwise actions. God may use physical evil (examples: Illness, pain, earthquakes, floods) for a higher purpose: to test us and prepare us for glory (1 Peter 1:6-7, 5:10, 2 Corinthians 12:7-9), or to make us more compassionate (2 Corinthians 1:3-6). The suffering we endure now will be more than compensated by the glory of eternal life (2 Corinthians 4:16-18, Philippians 1:21-23). Physical evil is one means God uses to accomplish His work on earth (John 9:1-3). It is very difficult to see any value in pain, suffering, loss of a loved one, disability, etc. However, these temporary evils are insignificant on the time scale of eternity, and they may just be a testing and preparation for better things to come. "For My thoughts are not your thoughts, Nor are your ways My ways," declares the LORD. "For as the heavens are higher than the earth, So are My ways higher than your ways And My thoughts than your thoughts." (Isaiah 55:8-9)
They can question all they want, but it does not change the truth that the only authority we can look to when we consider “inalienability" is God. God does not break His promises ..... but Kings and governments do lie and break promises.
Yes, we have come a long way from Magna Carta, but it was a beginning and an inspiration.