Are constitutional rights God given?
YES.
Rights are God given, nature given, creator given..or whatever floats your boat. Whatever the case, you didn't give them to yourself, nor did anyone else, so you can't forfeit them (by voting for totalitarianism, coercement by force or propaganda) nor can anyone else take them away.
The Constitution merely lists the most fundamental ones that the government ISN'T ALLOWED to touch. That's all it says. It says, these are the people's rights, don't touch them. It doesn't give nor take rights.
Who doesn't allow them to touch? We don't allow them. The Constitution is a social contract between the people who will be citizens and the people who will be government officials. The Constitution outlines how the government will be structured and what it can and cannot do. It's our format for them to follow, because in our system, WE'RE suppose to be in charge, they are suppose to work for us.
When they do evil things, often the built-in checks and balances system should catch it. When the whole system becomes corrupted and evil deeds bypass the checks and balances, then there is a violation of contract, and it's our choice whether or not to enforce the terms of the contract, or render it null and void. This assumes that both sides cannot come to terms.
That's the part where we all take our rifles, march on D.C., and shoot every single thug politician that is breaking the deal and trying to steal our money and enslave us or kill us.
After that bloodbath, we can just consider it enforcement of the contract, or we can just start all over with a new one if we think it needs improvement.
There are few problems with that. Too much time has passed, and as a result, the government thinks it's autonomous. It is completely evident that they have a gang-like attitude and elitist thought process. So instead of us all being one people together, it is more of an us vs. them situation.
Being that the government has broken the contract, and has delcared itself ruler of the people, rather than subservient to the people - to increase its foothold on power, it has established a number of defenses. Like stripping the people of effective arms and estabilishing standing armies. This prevents us from overthrowing them. Overthrowing them is our moral duty as Jefferson said in the Declaration of Independence. They've gained other forms power, such as ejecting the people from the political process by creating a bogus 2 party system that creates the illusion of choice, by establishing control over all the media, and by taking over education. By doing this, they have the population busy quarreling with themselves over meaningless politics, rather than seeking restitution for their grievances. Most people are dumbed down, and never even think of themselves as oppressed because they've been told through government education that they live like kings. Others are impoverished and face a life long financial struggle, which keeps them physically and mentally occupied.
It didn't have to be like that. All of this happened as a result of people not acting in time. Jefferson thought that government should be overthrown once every few decades. He was right. Government destroys itself quickly due to human beings being corrupt or evil (remember, all the evil ones tend to gravitate towards things like government, because it offers them a position of power) It's our job to keep them in check. We gave that up. So we're stuck now, and all we can do is whine on the internet about it.
Well, that's how it all works, or doesn't work depending on your point of view.