WI "French" Revolution not in France

What would be the most plausible candidate country in Europe to have a "French Revolution" instead of France. The characteristics that I'm thinking of that made it unique were: atheism, regicide, republicanism, a claim for universal rights and a claim of universal validity in general.

In some dimensions you could argue the American Revolution was the first "French" Revolution, but Edmund Burke noted important differences - he saw the American grievances as more specific and grounded in local traditions, whereas the French Revolution seemed far more of a departure from the French past.

The regicide of Charles in England didn't seem as world changing at the time because it was tied in with a pre-enlightenment relgious dispute.

So, the American Revolution can happen or not happen, but I'm looking for a substitute for France in Europe.

In the late 18th century? France was pretty damn unique. England may be doable, but hard.

Russia, ironically, may work.

Italy

Several of the Italian states shared the Republian values of France, with the populations welcomeing the French repulican troops.

Faeelin said:

In the late 18th century? France was pretty damn unique. England may be doable, but hard.
Russia, ironically, may work.

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Surely France was unique, especially in terms of its obvious impact across Europe.

As Dusquesne mentioned, maybe the Italian states would be up for it, but it would have a far more limited effect on the balance of power.

Russian atheist revolution in the late 18th century. Really interesting. Would be an interesting as all get out TL. What did you have in mind, a Pugachev victory, or a rising in the capital?

Why is Russia more likely than say Sweden, Prussia or Austria?