AHC/WI: Catholic Sweden

King Gustav I had formally severed ties with the RCC to create the Church of Sweden. Before that, Catholic feeling was never that strong in the first place. So how can we have Sweden remain Catholic and what effect would this have on the Reformation (specifically, the Thirty Years' War). Thank you.
 
I don't know the answer but I'm interested and if anyone wants to go a step further, how would Denmark (I assume it still goes Protestant) react?
 
Didn't the Swedes dislike it when the Catholic Sigismund became king and brought in a new prayer book. IIRC it led to a bit of...um...unpleasantness and THAT was before they deposed him.
 
Realistically, Sweden appears to have been in a position were a strong ruler could have taken them either way, and it was rather dumb luck that found Gustav I opposing the pope. Even then, the transition did falter during the Dacke War, wherein southern Sweden rebelled in favor of the Catholic rebel leader Nils Dacke, so we can assume that, had Gustav wished to remain in the church he could have done so with plenty of support.

Of course, it would make the Denmark-Sweden rivalry far more bitter if they were on opposite sides in a religious conflict, just as it did for Britain and her Catholic rivals and later Austria and Prussia. How that shifts the balance as late as the 30 Years War is anybody's guess, assuming the conflict even still exists. For all we know Sweden could be a millstone around the neck of any prospective Catholic league rather than the unexpected heroes they were for the Protestants in the war IOTL.
 
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