The circle is counterproductive because it created enemies out of mages who wouldn't otherwise be revolting and has the land in a civil war.
It has prevented Uldreds and other Would-Be Magisters for the past 900 years. One moderately sucessfull rebellion in all that time is a very good track record.
You can give a child magic and get Wynne, Bethany, a Grey Warden, Hawke, an Inquisitor, Vivienne, etc, etc etc as well. But in the way you see the world they should all be locked up. The hero of Ferelden locked up in a circle after saving the land, and this makes sense?
The Hero of Ferelden is a Warden; they're not kept in the Circles.
And yes, the freedoms of every single one you mentioned should be restricted. Because they are all dangerous. Because they can be possessed. Possible good character does not change these facts; until we can perfectly determine which mages will threaten the security and freedoms of normal people and which won't, I think we should apply restrictions to all of them much like every other citizen has his or her freedoms restricted for the safety of those around.
Normal children can't, by themselves, do what Connor did. A sword or a bow are not as dangerous as magic.
Also, they're not locked up in the Circles day and night for the rest of their lives. Bethany was allowed to leave to attend a party. You just have to prove you're trustworthy enough.
As far as your son, if he is a God then the question stands even more so. Not that I expected you to answer any part of it anyway.
Let' see, if the OGB was taken to Orlais' Circle, he'd live in Emperor Drakon's former palace and receive top notch education usually reserved to nobles and he'd be kept from hurting himself and others so... sure, why not?
In fact, being sent to the Circle is an upgrade for every mage that wasn't born a noble.