WI Protestant Hapsburg's

So what if Queen Mary's false pregnancy was real and a daughter is born. So sometime in '55 a daughter is born who is named Catherine after the Queen's mother. However soon enough little Catherine is crowned and through the suspicions of the Spanish, a Protestant faction is successfully able to control the regency with the infant queen becoming one herself. Skipping forward a few generations assuming things generally play out the same way leading to a atl Spanish War of Succession but with a Protestant claimant in England.
How would things change?
Could this Protestant "Hapsburg" coalition end up being victorious?
Feel free to make a tree if you want, they make the discussion in my view.
 
Weren't the Habsburgs supported hand and foot by the Catholic Church? Why would they break with their historical allies?
 
So what if Queen Mary's false pregnancy was real and a daughter is born. So sometime in '55 a daughter is born who is named Catherine after the Queen's mother. However soon enough little Catherine is crowned and through the suspicions of the Spanish, a Protestant faction is successfully able to control the regency with the infant queen becoming one herself. Skipping forward a few generations assuming things generally play out the same way leading to a atl Spanish War of Succession but with a Protestant claimant in England.
How would things change?
Could this Protestant "Hapsburg" coalition end up being victorious?
Feel free to make a tree if you want, they make the discussion in my view.
If Queen Mary has a daughter, descendants of this daughter would not be Habsburgs (unless this daughter would marry another Habsburg herself).
 
Protestant Hapsburgs is like Jewish Saudi Arabia. ASB. They were the sole defenders of the church at times. Protestant France is much more likely. Protestant Hapsburgs means that the whole Catholic Church is falling down and the rest of Western Europe is not only Protestant but also invading Hapsburg lands and demands their conversion.
 
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