Protestant France

I was thinking about my (probably never happening) Charles V adds Munster and East-Frisia to the Netherlands timeline. While thinking about it I decided to add some butterflies that could happen. One of the things I thought about was a protestant France. I thought it was an interesting idea, even if we ignore the larger Netherlands scenario (which from now on, we do in this post).
How could a protestant France happen with a POD around the middle of the fiftheenth century (or perhaps a bit earlier)? Or at least a France that is as protestant as the Netherlands, with a protestant majority and protestant rule, but a significant catholic minority (preferably treated decently, eventhough not as equals). What kind of protestantism would France convert to? I assume Calvinism, if I remember my history correctly. What kind of differences would a protestant France mean in terms of European politics?
 
A Protestant France would have good reason to fight Spain, and would probably support the Protestant states in the HRE. This would create a Europe divided between the French and Protestant Germans and the Spainish and Austrans (with probable support from the Catholic Germans)
 
If there were no Affaire des Placards in 1534, then Francis I would still tolerate Protestantism and support it as a way to undermine the Hapsburgs. So the movement would continue unhindered in France, and as more and more of the population converted, maybe the king would eventually convert too.
 
If there were no Affaire des Placards in 1534, then Francis I would still tolerate Protestantism and support it as a way to undermine the Hapsburgs. So the movement would continue unhindered in France, and as more and more of the population converted, maybe the king would eventually convert too.
I have not heard about this event before and after reading the wikipedia article about this is what I thought:
A bad PR stunt was the most important thing stopping France of becoming a protestant nation?
 
I have not heard about this event before and after reading the wikipedia article about this is what I thought:
A bad PR stunt was the most important thing stopping France of becoming a protestant nation?

Before the "stunt," Francis tolerated Protestantism and allowed it to spread in France. But Francis came to view the Affaire as a conspiracy against him, and retaliated and repressed accordingly.
 
If Philip II could be butterflied away, a lot of Spanish support of various Catholic organizations in France would disappear, making it that much easier for Protestants to rise to power.
 
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