Dear Avi,
The Declaration of Independence is a letter to King George 3 justifying the Colonies right and obligation to break off of The British Empire. It has no legal implications. It has the same weight as this post.
The Bill of Rights, are ten out of the first twelve proposed amendments to The Constitution Of The United States. The Constitution deals with the separation of powers. All the iOS and outs of government and bureaucracy. In short, that today we call The Swamp. Some paranoid people thought that having a balanced government meant that they would personal autonomy. [Go figure. They had Fake News then also.] To pacify them, John Madison schemed up twelve restrictions of government that the States could ratify. Of which ten were immediately ratified. The paranoid people wanted them in worked into the constitution. Madison merely added them to The Constitution. Thus they became amendments.
They are obviously not God given rights, because then why would the States have to ratify them? And what about the first proposed amendment which is still not ratified? Read through the Bill of Rights. It is hard to even call some of them rights. Definitely not self evident or God given.