You're reaching here man. All I can tell you is what our Founding Fathers believed. I get this through the Constitution, Bill of Rights and their own personal writings.1. If it's a God-given right, where in the Bible is there anything to support this?
As for the bible, I personally believe that book is mostly fiction and parables written as an example of how people should live their lives. However, I do believe that Christ is the son of God.
I can support the 2nd Amendment just like all the other Amendments with this:2. What is the meaning of "A well regulated Militia, being necessary to the security of a free State ..."? (i.e., the first words of the 2nd amendment) I've always thought that meant that the states could defend themselves against the central government, or join together in fighting a foreign enemy. But I'd argue that is does not say there should be unregulated gun ownership by individuals. That is an interpretation.
Put yourself in the place of a colonist back in the 1770's when the British were went over by our king to put us "in our place".
What exactly did the British do to their own citizens?
They would not let them form large groups (the cause of the 1st Amendment).
They wouldn't let them worship how they wanted since British citizens were supposed to be members of the church of England (1st Amendment).
They took over the press (the cause of the 1st Amendment).
They unarmed them (the cause of the 2nd Amendment).
They forced the colonists to take in the army and feed them (the cause of the 3rd Amendment).
The British searched anyone at any time within the home or person without any cause (the cause of the 4th Amendment).
They forced the 'detained' to answer questions and often tortured them to get the answer they wanted (the cause of the 5th Amendment).
The British army punished as they saw fit, on a daily basis, with no regard to constancy (the cause of the 6th Amendment).
The British army would extort money, product and valuables in leu of punishment (the cause of the 7th Amendment).
The British army could charge an extreme amount for crimes, again no constancy (the cause of the 8th Amendment).
If you want to know the reason for the Bill of Rights, the British did all these things to their own citizens. Our Founding Fathers believed that these things were granted by God and should be respected at all costs. No government should EVER take these rights away.
You should read the Federalists Papers. They are quite fascinating.
As for "voting" being mentioned in the "expanded" Bill of Rights, yes that is true, but it's mostly to give the rights to women and people of color, so this reference by you is pretty thin.
Voting is not a right granted by God. It is something citizens do to create the type of government we want and has been amended many times over.